Service Manual
Gas/Electric Refrigerators
MODELS
N61X/N81X
N62X/N82X
N64X/N84X
N64XIM/N84XIM
N64X.3/N84X.3
WARNING
!
DO NOT install this refrigerator in below deck marine applications. Do not
install this refrigerator in fixed indoor cabin or other dwelling applications. This
refrigerator must use only NORCOLD designed and approved outside air in-
take and exhaust ventilation for correct and safe operation. Any other ventila-
tion could cause lethal combustion exhaust fumes and or/explosive propane
gas fumes to be in the living area and/or below deck.
© 2003 THETFORD/NORCOLD. All rights reserved.
Publication No. 619394E (01-28-04)
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AUTO Mode ...................................................................... 52
No AC Power ..................................................................... 52
AC Power Restored .......................................................... 52
No AC and No Flame ........................................................ 52
GAS Mode......................................................................... 52
No Flame ........................................................................... 52
Backup Operating System .................................................. 52
“Gas Lock-Out” ................................................................... 52
N62X/N82X Optical Control Assembly ............................... 53
Front Box........................................................................... 53
Removal and Installation of Optical Control Assembly..... 53
Modes of Operation ............................................................ 54
AUTO Mode ...................................................................... 54
AUTO AC Operation ......................................................... 54
AUTO LP Gas Operation .................................................. 54
Shift from AUTO LP GAS to AUTO AC ............................. 54
No AC Power and No Flame ............................................. 54
Troubleshooting a "F"/"no" "FL" and "A"/"no" "AC" Faults 54
AC-Manual Mode .............................................................. 54
LP Gas–Manual Mode ...................................................... 54
No AC Power or Loss of AC Power .................................. 55
Troubleshooting a "A"/"no" "AC" Fault.............................. 55
AC Power Restored .......................................................... 55
Flame Fails to Ignite or Flame Goes Out ......................... 55
Clearing "Gas Lock-Out" ................................................... 55
Troubleshooting a "F"/"no" "FL" Fault............................... 55
N64X/N84X Optical Control Assembly ............................... 56
Front Box........................................................................... 56
Removal and Installation of Optical Control Assembly..... 56
Modes of Operation ............................................................ 57
AUTO ................................................................................ 57
AUTO AC Operation ......................................................... 57
AUTO LP Operation .......................................................... 57
Shift from AUTO LP GAS to AUTO AC ............................. 57
No AC Power and No Flame ............................................. 57
Shift from AUTO LP GAS to AUTO AC ............................. 57
Troubleshooting No Flame and No AC Faults .................. 57
AUTO DC Operation – 3-Way Units Only ......................... 58
AC-Manual Mode ................................................................ 58
No AC Power or Loss of AC Power .................................. 58
AC Power Restored .......................................................... 58
Troubleshooting "no" "AC" Fault ....................................... 58
LP-Manual Mode................................................................. 59
Flame Fails to Ignite or Flame Goes Out ......................... 59
DC-Manual Mode ................................................................ 59
No DC Power to DC Heater Circuit .................................. 59
Low Ice Yield ....................................................................... 69
Water Valve Operation Test ................................................ 69
Water Valve Solenoid Resistance ...................................... 69
Mold Heater Resistance Check .......................................... 70
Checking Voltage at Motor Terminals ................................. 70
Winterizing the Ice Maker Water ........................................ 70
N64X IM/N84XIM – Wiring Pictorial for Ice Maker Wired to
Refrigerator AC Cord .......................................................... 70
N64X IM/N84XIM – Wiring Schematic for Ice Maker Wired to
Refrigerator AC Cord .......................................................... 70
N64X IM/N84XIM – Wiring Schematic for Ice Maker Wired to
White AC Power Cord ......................................................... 72
N64X IM/N84XIM – Wiring Pictorial for Ice Maker Wired to
White AC Power Cord ......................................................... 72
Diagnostic Mode — Models N62X/N82X --------------60
Diagnostic Mode ................................................................. 60
Accessing the Diagnostic Mode ....................................... 60
Changing Screens ............................................................ 60
Exiting the Diagnostic Mode ............................................. 60
Screens and Diagnostic Segments Information ............... 61
Diagnostic Mode — Models N64X/N84X --------------63
Diagnostic Mode ................................................................. 63
Accessing the Diagnostic Mode ....................................... 63
Changing Screens ............................................................ 63
Exiting the Diagnostic Mode ............................................. 63
Screens and Diagnostic Segments Information ................. 64
Ice Maker --------------------------------------------------------66
Wire Harness ...................................................................... 66
Fill Tube .............................................................................. 66
Water Valve ......................................................................... 66
Specifications ...................................................................... 66
Replacing the Ice maker ..................................................... 67
Ice Maker Troubleshooting Chart ....................................... 67
Cycle Test ........................................................................... 68
Water Fill Adjustment .......................................................... 69
ii Refrigerator Service Manual
N6XX/N8XX Models
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INTRODUCTION
About this Manual
Certification and Code Requirements
This service manual provides maintenance, diagnostic, NORCOLD® N6XX/N8XX gas/electric absorption
and repair information for NORCOLD® models N6XX
and N8XX (N6XX/N8XX) gas absorption refrigerators. It
is a reference tool designed for technicians who are
knowledgeable in the theory and operation of gas/
electric absorption refrigerators, liquefied petroleum
(LP) gas–propane–systems, and AC/DC electrical
systems as installed in a variety of recreational
vehicles (RV).
refrigerators are certified under the latest edition of
ANSI Z21.19B standards for installation in mobile
homes or recreational vehicles, and with the Canadian
Standards Association CAN/CGA-1.4-M94.
Electrical components are
compliant.
About Installation
Refrigerator installation must conform with the N6XX/
N8XX Installation Manual for the NORCOLD® limited
warranty to be in effect. Installation must also comply
with applicable local codes and standards set by the
cognizant certification agency.
All information, illustrations, and specifications
contained in this publication are based on the latest
product information available at the time of publication.
NORCOLD® reserves the right to make changes at any
time without notice.
Replacement Parts
Model Identification
Use only authorized NORCOLD® replacement parts.
Generic parts do not meet NORCOLD® specifications
for safety, reliability, and performance. The use of
unauthorized aftermarket or generic replacement parts
voids the refrigerator's limited warranty coverage.
Models N61X, N81X, N62X, N82X, N64X, and N84X are
2-way refrigerators that operate on AC power or LP
gas.
Models N64X.3 and N84X.3 are 3-way refrigerators,
that operate on AC power, LP gas, or DC power.
Technical Assistance
Letter(s) appended to the model number identify
factory installed accessories. For example, an N821F
is a 2-way refrigerator equipped with a factory installed
12 Vdc cooling unit ventilation fan; an N641IM is a 2-
way refrigerator equipped with an ice maker.
If unable to resolve technical issues using the
information provided in this manual, technical support
is available through NORCOLD® Customer Service
Center:
' Telephone: .................................... 1-800-444-7210.
7 Fax: .............................................. 1-937-497-3183.
Information Label
The information label is located in the upper right
corner of the fresh food compartment just below the
divider. See Figure 1, page 2. The label provides the
following information:
The following information is required to process
technical support requests:
n
n
n
n
n
n
n
n
Serial number.
Model number.
n
n
n
Model number.
LP gas (propane) pressure.
Btu/h.
Serial number.
Make, model, and year of recreational vehicle.
AC voltage and amperage.
DC voltage and amperage.
Design certification.
Vent kit requirement.
Cooling Unit Serial Number
The cooling unit serial number appears on the cooling
unit bar code label. The label is affixed to the surface
of the cooling unit leveling chamber. See Figure 2,
page 2.
Refrigerator Service Manual
N6XX/N8XX Models
1
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Figure 1. Refrigerator Information Label Location.
Figure 2. Cooling Unit Bar Code Label Location.
2
N6XX/N8XX Models
Refrigerator Service Manual
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SAFETY AWARENESS
Safety Notice
It is not possible to anticipate all of the conceivable
ways or conditions under which the refrigerator may be
serviced or to provide cautions as to all of the possible
hazards that may result. Standard and accepted safety
precautions and equipment should be used when
working on electrical circuits and handling toxic or
flammable materials. Safety goggles and other
required protection should be used during any process
that can cause material removal, such as when
removing a leaking cooling unit and cleaning
components.
The safety alert symbol with the appropriate heading
appear on all safety labels posted on the refrigerator
and safety awareness notices presented throughout
this manual.
!
WARNING:
The above heading identifies hazards or conditions,
which if ignored can cause serious injury, death, and/
or extensive property damage.
Attention Statements
!
The safety alert symbol ‹ followed by the word
WARNING or CAUTION identifies potential safety
hazards or conditions.
CAUTION:
The above heading identifies hazards, which if ignored
can cause injury and/or property damage.
Safety Statements
‹Do not use leak test solutions that contain ammonia
or chlorine. Ammonia and chlorine degrade copper and
brass components.
‹Do not modify, alter, or equip the refrigerator to the
use of any other fuel (natural gas, butane, etc.). N6XX/
N8XX refrigerators are designed and equipped for the
use of LP gas–propane gas–only.
‹The cooling unit is a sealed system under
pressure! Do not try to repair or recharge the cooling
unit. Do not bend, drop, weld, drill, puncture, saw, or
strike the cooling unit.
‹Incorrect installation, adjustment, alteration, or
maintenance of the refrigerator can cause personal
injury, property damage, or both.
‹Handle a leaking cooling unit with extreme
caution! The cooling unit contains ammonia,
hydrogen, and sodium chromate. Ammonia can cause
severe skin and eye burns. Hydrogen is highly
flammable, can ignite and burns with an intense flame.
Certain chromium compounds, such as sodium
chromate, are carcinogenic.
‹Do not smoke, light fires, or create sparks when
working on the propane gas system.
‹Do not use an open flame for leak testing any of the
propane gas system components. Propane gas is
highly flammable and explosive.
‹Always use two wrenches to tighten or loosen LP gas
connections. Damaged connections, piping, and
components create the potential for gas leaks.
‹Do not use extension cords. Do not remove the
grounding prong from the refrigerator AC power cord.
Do not use a two prong adapter to connect the
refrigerator to the AC outlet.
‹All electrical connections and repairs to the
refrigerator must comply with all applicable codes.
Refer to the certification and code requirements
section of the N6XX/N8XX Installation Manual.
‹Do not over-fuse electrical circuits. Use specified
fuses and AWG wire sizes. The specification section
of this manual provides fuse size information. Refer to
the N6XX/8XX Installation Manual for the correct AWG
wire size specifications.
‹Do not work on live electrical circuits. Turn off AC
power and DC power sources before attempting to
remove, service, or repair any of the refrigerator's
electrical or electronic components.
‹Prevent child entrapment! Before disposing of the
refrigerator, remove all doors and fasten all shelves
with retainers.
‹Do not modify, bypass, or eliminate any of the
refrigerator's electrical components, electronic circuits,
or propane gas system components.
‹Some of the refrigerator's metal components have
sharp corners and edges. Wear hand protection, such
as cut resistant gloves, and exercise extreme care
when handling the refrigerator.
‹Do not wet or spray liquids on or near electrical
connections or electronic components. Most liquids,
including leak detection solutions, are electrically
conductive and pose the potential for an electric shock
hazard, short electrical components, damage
electronic circuits, and/or ignite a fire.
‹Make sure all hardware such as hinges and fasteners
(retaining screws, etc.), are properly fastened.
Refrigerator Service Manual
N6XX/N8XX Models
3
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SPECIFICATIONS
N61X/N81X Models
Storage volume
N61X --------------------------------------------------------------------------------------------------------------------------------- 6.3 ft3.
N81X --------------------------------------------------------------------------------------------------------------------------------- 7.5 ft3.
Rough opening dimensions (H x W x D)
N61X ------------------------------------------------------------------------------------------------------ 52
N81X ----------------------------------------------------------------------------------------------------- 59
7
/8
1/2
1/2
in. x 23
in. x 23
in. x 24 in.
in. x 24 in.
7
/8
Decorative panels dimensions
Thickness ---------------------------------------------------------------------------------------------------------------------------
Freezer door (H x W, both models) ---------------------------------------------------------------------14
Fresh food compartment (H x W)
N61X ------------------------------------------------------------------------------------------------------------- 31
N81X ------------------------------------------------------------------------------------------------------------- 38
3/16
in.
in.
17/32
19/32
in. x 21
5/8
5/8
19/32
19/32
in. x 21
in. x 21
in.
in.
Controls
Type ---------------------------------------------------------------------------------------------- Electronic with built-in diagnostics
Mode selector switch ------------------------------------------------------------------------------------------ 3-position slide type
Temperature switch --------------------------------------------------------------------------------------------- 5-position slide type
Temperature settings ---------------------------------------------------------------------------------------------- 1=cold, 5=coldest
Temperature sensor ----------------------------------------------------------------------------- Thermistor, fin mounted (10th fin)
Off-level operating limits
Side-to-side------------------------------------------------------------------------------------------------------- 3 degrees-maximum
Front-to-back ----------------------------------------------------------------------------------------------------- 6 degrees-maximum
DC power
Controls operating voltage ----------------------------------------------------------------------------------------- 10.5 to 15.4 Vdc
Fuse, control circuit (F1 in power board) -------------------------------------------- 5A(tan color), automotive blade type
1
1
Fuse, fan (N6XXF/N8XX F models with an in-line fuse) --------------------- 1 A,
in. x 1
in. AGC type fast acting
/4
/4
DC amperage draws (at nominal 12 Vdc)
Automatic ignition----------------------------------------------------------------------------------------------------------------- 0.50A
Divider heater ---------------------------------------------------------------------------------------------------------------------- 0.25A
Fresh food compartment lamp ------------------------------------------------------------------------------------------------- 0.46A
Gas valve--------------------------------------------------------------------------------------------------------------------------- 0.146A
Fan (N6XX/FN8XXF models only) ---------------------------------------------------------------------------------------------- 0.36A
AC power
AC heater operating voltage ----------------------------------------------------------------------------------------- 108 to 132 Vac
1
1
Fuse, AC heater circuit (F3 in power board) ---------------------------------- 5 A,
in. x 1
in. AGC type fast acting
/4
/4
AC heater rating ------------------------------------------------------------------ 300 W/2.5 A @ 120 Vac (resistance of 48Ω)
LP gas (propane)
Operating pressure ---------------------------------------------------------------------------------------------- 10.5 to 11.5 in. w.c.
Heat output --------------------------------------------------------------------------------------------------1500 Btu/h @ 11 in. w.c.
Orifice ---------------------------------------------------------------------------------------------------------------------------------- LP16
Gas ignition---------------------------------------------------------------------------------- Automatic with flame sensing circuit
Electrode tip-to-burner air gap ---------------------------------------------------------------------------------------- 1/8 to 3/16 in.
4
N6XX/N8XX Models
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N62X/N82X Models
Storage volume
N62X --------------------------------------------------------------------------------------------------------------------------------- 6.3 ft3.
N82X --------------------------------------------------------------------------------------------------------------------------------- 7.5 ft3.
Rough opening dimensions (H x W x D)
N62X ------------------------------------------------------------------------------------------------------ 52 /8 in. x 23 /2 in. x 24 in.
N82X ------------------------------------------------------------------------------------------------------ 59 /8 in. x 23 /2 in. x 24 in.
7
1
7
1
Decorative panels dimensions
Thickness --------------------------------------------------------------------------------------------------------------------------- /16 in.
Freezer door (H x W, both models) ---------------------------------------------------------------------14
Fresh food compartment door
N62X --------------------------------------------------------------------------------------------------------------31 /8 in. x 21 /32 in.
3
17/32
19/32
in. x 21
in.
5
19
5
19
N82X --------------------------------------------------------------------------------------------------------------38 /8 in. x 21 /32 in.
Controls
Type --------------------------------------------------------------------------------------- Electronic with built-in diagnostic mode
ON/OFF/MODE/TEMP SET switches ------------------------------------------------------------------------ Flush push-button
Temperature settings ---------------------------------------------------------------------------------------------- 1=cold, 9=coldest
Temperature sensor ----------------------------------------------------------------------------- Thermistor, fin mounted (10th fin)
Off-level operating limits
Side-to-side------------------------------------------------------------------------------------------------------- 3 degrees-maximum
Front-to-back ----------------------------------------------------------------------------------------------------- 6 degrees-maximum
DC power
Controls operating voltage ----------------------------------------------------------------------------------------- 10.5 to 15.4 Vdc
Fuse, control circuit (F1 in power board) -------------------------------------------- 5A(tan color), automotive blade type
1
1
Fuse, fan (N6XXF/N8XX F models with in-line fuse) ------------------------- 1 A,
in. x 1
in. AGC type fast acting
/4
/4
DC amperage draws (at nominal 12 Vdc)
Automatic ignition ----------------------------------------------------------------------------------------------------------------- 0.50A
Divider heater ---------------------------------------------------------------------------------------------------------------------- 0.25A
Fresh food compartment lamp ------------------------------------------------------------------------------------------------- 0.46A
Gas valve --------------------------------------------------------------------------------------------------------------------------- 0.146A
Fan (N6XX/FN8XXF models only) ---------------------------------------------------------------------------------------------- 0.36A
AC power
AC heater operating voltage ----------------------------------------------------------------------------------------- 108 to 132 Vac
1
1
FuseAC heater circuit (F3 in power board) ----------------------------------- 5 A,
in. x 1
in. AGC type fast acting
/4
/4
AC heater rating
Refrigerators with serial number lower than 854647 -----------------300 W/2.7 A @ 110 Vac (resistance of 41.25 Ω)
Refrigerators with serial number 854647 and higher --------- 300 W/2.5 A/48 Ω @ 120 Vac (resistance of 41.25 Ω)
LP gas (propane)
Operating pressure ---------------------------------------------------------------------------------------------- 10.5 to 11.5 in. w.c.
Heat input ----------------------------------------------------------------------------------------------------1500 Btu/h @ 11 in. w.c.
Orifice, new style-------------------------------------------------------------------------------------------------------------------- LP16
Orifice, old style ---------------------------------------------------------------------------------------------------------- 0.155 jeweled
Gas ignition---------------------------------------------------------------------------------- Automatic with flame sensing circuit
Electrode tip-to-burner air gap --------------------------------------------------------------------------------------- 1/8 to 3/16 in.
Refrigerator Service Manual
N6XX/N8XX Models
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N64X/N64X.3/N84X/N84X.3 Models
Storage volume
N64X/N64X.3 ----------------------------------------------------------------------------------------------------------------------- 6.3 ft3.
N84X/N84X.3 ----------------------------------------------------------------------------------------------------------------------- 7.5 ft3.
Rough opening dimensions (H x W x D)
N64X/N64X.3 -------------------------------------------------------------------------------------------- 52 /8 in. x 23 /2 in. x 24 in.
N84X/N84X.3 -------------------------------------------------------------------------------------------- 59 /8 in. x 23 /2 in. x 24 in.
7
1
7
1
Decorative panels dimensions
Thickness --------------------------------------------------------------------------------------------------------------------------- /16 in.
Freezer door (H x W, both models) --------------------------------------------------------------------- 14 /32 in. x 21 /32 in.
Fresh food compartment door
N64X/N64X.3 ----------------------------------------------------------------------------------------------------31 /8 in. x 21 /32 in.
3
17
19
5
19
5
19
N84X/N84X.3 ----------------------------------------------------------------------------------------------------38 /8 in. x 21 /32 in.
Controls
Type ------------------------------------------------------------------------------------ Electronic with built-in diagnostic function
ON/OFF/MODE/TEMP SET switches ---------------------------------------------------------------------- Raised push-button
Temperature settings ---------------------------------------------------------------------------------------------- 1=cold, 9=coldest
Temperature sensor ----------------------------------------------------------------------------- Thermistor, fin mounted (10th fin)
Off-level operating limits
Side-to-side------------------------------------------------------------------------------------------------------- 3 degrees-maximum
Front-to-back ----------------------------------------------------------------------------------------------------- 6 degrees-maximum
DC power
Controls operating voltage ----------------------------------------------------------------------------------------- 10.5 to 15.4 Vdc
DC fuse (F1 in power board) ------------------------------------------------------------ 5A(tan color), automotive blade type
DC heater rating ----------------------------------------------------------------- 225 W/16 A @ 14 Vdc (resistance of 0.87 Ω)
DC heater operating voltage (3-way models only) ------------------------------------------------------------------ 12 – 14 Vdc
Fuse, DC heater (F2, in power board) ------------------------------------------- 30A(green color), automotive blade type
1
1
Fuse, fan (N6XXFw/N8XX F models with in-line fuse holder) -------------- 1 A,
in. x 1
in. AGC type fast acting
/4
/4
DC amp draws (at nominal 12 Vdc)
Automatic ignition ----------------------------------------------------------------------------------------------------------------- 0.50A
DC heater --------------------------------------------------------------------------------------- 13.79 A @ 12 Vdc/16 A @ 14 Vdc
Divider heater ---------------------------------------------------------------------------------------------------------------------- 0.25A
Fresh food compartment lamp ------------------------------------------------------------------------------------------------- 0.46A
Gas valve --------------------------------------------------------------------------------------------------------------------------- 0.146A
Fan (N6XX/FN8XXF models only) ---------------------------------------------------------------------------------------------- 0.36A
AC power
AC heater operating voltage requirements ----------------------------------------------------------------------- 108 to 132 Vac
1
1
FuseAC heater circuit (F3 in power board) ------------------------------------ 5 A, in. x 1
in. AGC type fast acting
/4
/4
AC heater rating
Refrigerators with serial number lower than 854647 -----------------300 W/2.7 A @ 110 Vac (resistance of 41.25 Ω)
Refrigerators with serial number 854647 and higher -------------------- 300 W/2.5 A @ 120 Vac (resistance of 48 Ω)
LP gas (propane)
Operating pressure ----------------------------------------------------------------------------------------------- 10.5 to 11.5 in. w.c
Heat input -----------------------------------------------------------------------------------------------------1500 Btu/h @ 11 in. w.c
Orifice, new style-------------------------------------------------------------------------------------------------------------------- LP16
Orifice, old style ---------------------------------------------------------------------------------------------------------- 0.155 jeweled
Gas ignition---------------------------------------------------------------------------------- Automatic with flame sensing circuit
Electrode tip-to-burner air gap --------------------------------------------------------------------------------------- 1/8 to 3/16 in.
6
N6XX/N8XX Models
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TROUBLESHOOTING – QUICK REFERENCE GUIDE
Problem
Possible Cause
Checks/Reference
No 12 Vdc power to refrigerator.
Faulty/loose 12 Vdc connections.
F1 fuse in power board open.
See page 11.
Check 12 Vdc connections.
Check fuse F1, (5 amp) in power board.
The refrigerator does not turn ON.
No AC power to refrigerator.
F3 fuse in the power board open.
AC heater failed open.
See page 16.
Check fuse F3, (5 amp) in power board.
See page 18.
The refrigerator does not cool on
AC power.
The refrigerator does not cool
efficiently on AC power.
Ventilation obstructed.
AC voltage low.
Check enclosure for air flow obstructions.
See page 17.
3-Way Units Only
F2 fuse in power board open.
DC heater failed open.
Check fuse F2 (30 amp) in power board.
See page 15.
The refrigerator does not cool on
DC power.
3-Way Units Only
Ventilation obstructed.
DC voltage below 12 volts.
Check enclosure for obstructed air flow.
Check RV 12 Vdc power supply.
The refrigerator does not cool
efficiently on DC power.
No LP gas.
Check LP gas supply and valves.
See page 12.
See page 12.
The refrigerator does not operate
on LP gas.
Incorrect electrode tip-to-burner gap.
Faulty spark/sense electrode assembly.
Flame sensing circuit failure.
See page 13.
Ventilation obstructed.
Incorrect LP gas pressure.
Dirty burner.
Check enclosure for obstructed air flow.
See page 12.
See page 12.
The refrigerator does not
cool efficiently on LP gas.
Missing flue baffle.
Heat deflector blocked.
See page 30.
See page 30.
Poor ventilation.
Off-level operation.
DIrty burner.
Check enclosure for obstructed air flow.
See page 37.
See page 31.
"no" "co" code.
Low AC voltage.
Cooling fan inoperative.
Improper installation.
Incorrect orifice.
See page 34.
See page 35.
See pages 22-26.
See page 29.
Refrigerator Service Manual
N6XX/N8XX Models
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N61X/N81X DISPLAYED FAULT CODES
Probable Cause
Reference
Problem
Refrigerator turned off.
No 12 Vdc to refrigerator.
F1 fuse open.
See page 11.
ON LED off.
In AUTO operation:
No AC power or LP gas available
ON LED and GAS LED flashing at one second
intervals.
See page 16.
See page 12.
GAS operation:
Burner failed to ignite or reignite.
ON LED on.
GAS LED flashes at one second intervals.
"Gas lock-out."
Burner failed to ignite or reignite.
See page 12.
ON LED flashes once every three seconds.
Back-up system operation.
See page 20.
Mode switch failure. Refrigerator
operating in last selected mode.
Replace optical
control assembly.
ON LED flashes twice every three seconds.
ON LED flashes three times every three
seconds.
AC heater failure.
See page 18.
Replace
ON LED flashes four times every three seconds.
Controls failure.
power board.
ON LED flashes five times every three seconds.
No cooling detected by the controls.
See pages
21 & 37.
8
N6XX/N8XX Models
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N62X/N82X DISPLAYED FAULT CODES
Code
Probable Cause
Reference
Refrigerator turned off.
No 12 Vdc to refrigerator.
F1 fuse open.
Blank
Display
Screen
See page 11.
Burner failed to ignite or reignite.
Flame sense circuit failure.
DC voltage low.
See page 12.
See page 13.
See page 13.
See page 14.
See page 16.
See page 16.
See page 18.
See page 19.
See page 20.
DC voltage high.
AC relay stuck closed.
No AC power available to refrigerator.
AC cord not plugged into power board.
F3 fuse open.
AC heater failed open.
Fresh food compartment door open more then 2 minutes.
Lamp reed relay switch faulty.
Flashing
Temp
Setting
Back-up operating system.
No cooling detected by the controls.
See pages
21 & 37.
Refrigerator Service Manual
N6XX/N8XX Models
9
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N64X/N84X DISPLAYED FAULT CODES
Probable Cause
Code
Reference
Refrigerator turned off.
No 12 Vdc to refrigerator.
F1 fuse open.
Blank
Display
Screen
See page 11.
a
l
The burner failed to ignite or reignite.
Flame sense circuit failure.
See page 12.
See page 13.
Alarm
a
i
Alarm
t
See page 13.
DC voltage low.
s
p
A
A
A
DC relay stuck closed, 3-way models only.
DC voltage high.
See page 14.
See page 14.
Alarm
i
s
p
p
DC heater failure, 3-way models only.
See page 15.
See page 16.
Alarm
D
A
A
No AC power available to refrigerator.
AC cord not plugged into power board.
F3 fuse open.
Alarm
Alarm
s
p
AC relay stuck closed.
See page 16.
a
i
n
p
t
l
AC voltage low.
See page 17.
See page 17.
s
a
g
g
AC voltage high.
AC heater failed open.
s
s
p
a
See page 18.
See page 19.
See page 20.
Alarm
p
Fresh food compartment door open more than 2 minutes.
Lamp reed relay switch faulty.
Alarm
Flashing
Temp
Back-up operating system.
Setting
i
No cooling detected by the controls.
See pages
21 & 37.
Alarm
s
p
10
N6XX/N8XX Models
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TROUBLESHOOTING FLOWCHARTS
Blank Display – Refrigerator does not turn on
Before beginning this procedure make sure:
■
The RV DC power system is supplying 10.5 to 15.4 volts to the refrigerator.
No other RV appliances or lighting circuits are connected to the refrigerator DC circuit.
12 Vdc input to the power board is wired according to the N6XX/N8XX installation manual.
■
■
Models and fault indicator displayed.
Blank
Display
Screen
ON
Blank
Display
Screen
AC
LP GAS
GAS check if flashing
AUTO
N61X/N81X
N62X/N82X
N64X/N84X
Measure voltage at power
board 12VDC and GND1
connections.
10.5
to
NO
NO
NO
1. No DC power input from RV to unit.
2. Faulty wiring or connectors.
15.4 Vdc?
YES
Check condition of F1 fuse
in power board. See Figure A.
Replace fuse. Use a standard 5 amp
(tan color) automotive blade type fuse.
F1 fuse okay?
YES
Measure voltage at optical
control harness.
See Figure B.
Voltage
present?
Replace power board.
YES
Replace optical control board.
Wire harness optical
control display connector
Good= 00.0
Ω
White/violet wire
White/red wire
Bad = OL
RMS MULTIMETER
87III TRUE
10.5 to 15.4 Vdc
00.0
RMS MULTI METER
87III TRUE
RANGE
HOLD
H
MIN MAX
REL
Hz
4
1/2 DIGITS PEAK MIN MAX
1
Seconds
V
mV
MIN MAX
RANGE
HOLD
H
mA
V
V
A
REL
Hz
4
1
/
2
D
I
G
I
T
S
P
E
A
K
M
I
N
M
A
X
1
Seconds
µA
mV
mA
V
V
A
OFF
µA
OFF
A
mA µA
COM
V
A
mA µA
COM
V
400mA MAX
FUSED
!
10A MAX
FUSED
400mA MA
FUSED
T
I
I
10A MAX
FUSED
000V MAX
!
V
!
Optical control display wire harness connection voltage measuring points.
Checking DC fuse continuity.
Figure B.
Figure A.
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F/no FL Fault Code – Burner failed to ignite or reignite
Before beginning this procedure make sure:
■
RV LP gas tank valve is open.
Refrigerator solenoid gas valve manual shutoff is open.
LP gas pressure at the solenoid gas valve pressure tap is 10.5.
■
■
Models and fault indicator displayed.
ON
AC
LP GAS
GAS LED
flashing
constantly
GAS
AUTO
N61X/N81X
N62X/N82X
N64X/N84X
Check burner.
NO
NO
Burner
clean?
Clean and service burner.
See page 30.
YES
Air gap
1/8 to 3/16
inch?
Check that electrode tip-to-
burner air gap is correct.
Set electrode-to-burner air gap
1/8 to 3/16 inch.
YES
NO
NO
Replace spark/sense electrode
assembly.
Check spark/sense electrode
assembly for continuity.
Continuity?
YES
Check gas valve solenoid
resistance.
Replace gas valve.
79 to 85 Ω?
.
YES
NO
NO
Check gas valve solenoid
wires for continuity.
Continuity?
Replace gas valve wires.
YES
Check voltage across power
board terminals GV and
GV GND.
Voltage?
Replace power board.
YES
Faulty or obstructed gas valve.
Replace gas valve.
12
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S/Sr Fault Code – Flame sense circuit failure
Models and fault indicator displayed.
AC
LP GAS
AUTO
N62X/N82X
N64X/N84X
Flame sense circuit failure.
Replace power board.
See page 44.
dc LO Fault Code – Low DC voltage
Before beginning this procedure:
■
Make sure RV DC voltage to refrigerator is 10.5 to 15.4 volts.
Determine if the DC LO fault code displays when the converter is the source of DC power.
Make sure no other appliance or lighting circuit is connected to the refrigerator DC circuit.
■
■
Models and fault indicator displayed.
N64X/N84X
Check for DC voltage input
to power board terminals
12VDC and GND1.
Voltage
lower than
10.5 Vdc?
YES
Check RV 12 Vdc power supply to
refrigerator.
NO
See NOTE below to determine
and correct low dc LO fault.
NOTE
Electronic controls operate on 12 Vdc. When anAC/DC converter is used to
supply DC power, the refrigerator circuit must be connected to the appliance
output terminals of the converter (filtered side).
If the refrigerator circuit is connected to the unfiltered side, the AC ripple
generated by the converter may cause a dc LO fault code to display.
To troubleshoot a dc LO fault, connect a charged 12 volt automotive battery
to the power board. If the dc LO code clears, the fault was caused by unfiltered
DC power.
If the dc LO code does not clear, replace the power board.
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dc HI Fault Code – DC voltage high
Before beginning this procedure:
■
Make sure RV DC voltage to refrigerator is 10.5 to 15.4 volts.
Determine if the DC HI fault code displays when the converter is the source of DC power.
■
Models and fault indicator displayed.
AC
LP GAS
AUTO
N62X/N82X
N64X/N84X
Check for DC voltage input
to power board terminals
12VDC and GND1.
Voltage
higher than
15.4 Vdc?
YES
Check RV DC power distribution to
refrigerator.
NO
See NOTE below to determine
and correct low dc HI fault.
NOTE
Electronic controls operate on 12 Vdc. When anAC/DC converter is used to
supply DC power, the refrigerator circuit must be connected to the appliance
output terminals of the converter (filtered side).
If the refrigerator circuit is connected to the unfiltered side, the AC ripple
generated by the converter may cause a dc HI fault code to display.
To troubleshoot a dc HI fault, connect a charged 12 volt automotive battery to
the power board. If the dc HI code clears, the fault was caused by unfiltered
DC power. If the dc HI code does not clear, replace the power board.
dc rE Fault Code – DC relay stuck closed
Models and fault indicator displayed
N64X/N84X
DC relay stuck closed.
Replace power board.
See page 44.
14
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dc HE Fault Code – DC heater failed open
Before beginning this procedure make sure:
■
The RV DC electrical system is maintaining 10.5 to 15.4 Vdc to the refrigerator.
■
No other appliance or lighting circuit is connected to the refrigerator DC circuit.
Model and fault indicator displayed.
a
r
t
i
n
e
t
l
g
A
Audible
Alarm
D
y
a
i
s
l
N64X.3/N84X.3
Check condition of F2 fuse
in power board.
NO
NO
Replace fuse. Use a standard 30 amp
(green color) automotive blade type fuse.
F2 fuse
okay?
YES
Resistance
0.81 to 0.91
Check DC heater resistance.
See Figure.
Replace DC heater.
Ω?
YES
Replace power board.
DC heater resistance 0.81 to 0.91Ω.
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A/no AC Fault Code – No AC power available
Before beginning this procedure make sure:
■
No other problem exist with the RV AC power supply.
No other appliances or lighting circuits are connected to the refrigerator AC circuit.
Extension cords are not being used to supply AC power to the refrigerator.
■
■
Models and fault indicator displayed.
l
ON
AC
AUTO
LP GAS
GAS check if flashing
Does not operate on AC when set to AUTO.
N61X/N81X
i
l
N62X/N82X
N64X/N84X
Measure voltage at power
board AC cord connection.
108
to
NO
NO
NO
1. Check AC power input from RV to unit.
2. Check for faulty AC power cord.
132 Vac?
YES
Replace fuse. Use a 5 amp, 1/4" x 11/4
"
Check condition of F3 fuse
in power board.
F3 fuse okay?
AGC type fuse.
YES
Check that fuse holder clips
are making full contact with
fuse.
Adjust clips to ensure fuse contacts are
firm in clips and making full contact.
Clips okay?
YES
Replace power board.
r/AC rE Fault Code – AC relay stuck closed
Models and fault indicator displayed.
e
l
t
i
A
Audib
AC
LP GAS
AUTO
A
s
p
l
arm
N62X/N82X
N64X/N84X
Flame sense circuit failure.
Replace power board.
See page 44.
16
N6XX/N8XX Models
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AC LO Fault Code – AC voltage low
Before beginning this procedure:
■
Determine if a certain AC power source sets the AC LO fault code (generator, shore power, inverter).
■
Make sure no other appliance or lighting circuit is connected to the refrigerator AC circuit.
■
Make sure extension cords are not being used to supply AC power to the refrigerator.
Model and indicator displayed.
n
t
r
i
n
e
t
e
g
l
l
A
Audib
A
l
arm
D
y
a
i
s
l
N64X/N84X
Measure voltage at power
board AC cord connection.
Voltage
lower than
108 Vac?
Fault related to RV AC power distribution
component or circuit supplying AC power
to refrigerator.
YES
NO
Replace power board.
AC HI Fault Code – AC voltage high
Before beginning this procedure:
■
Determine if a certain AC power source sets the AC HI fault code (generator, shore power, inverter).
Model and indicator displayed.
a
r
t
i
n
e
e
l
t
l
g
A
Audib
A
l
arm
D
y
a
i
s
l
N64X/N84X
Measure voltage at power
board AC cord connection.
Voltage
higher than
132 Vac?
Fault related to RV AC power distribution
component or circuit supplying AC power
to refrigerator.
YES
NO
Replace power board.
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H/AC HE Fault Code – AC heater failed open
Before beginning this procedure make sure:
■
RV AC voltage to the refrigerator is 108 to 132 volts.
No other appliance or lighting circuit is connected to the refrigerator AC circuit.
■
Models and indicator displayed.
g
l
ON
Flashing 3 tim
es every 3 seco
nds
AC
AUTO
LP GAS
GAS
D
N61X/N81X
N62X/N82X
N64X/N84X
Check AC heater wires for
loose or damaged connector.
Heater
connections
Repair or replace connectors. If
connectors cannot be repaired,
replace heater.
NO
NO
okay?
YES
Check AC heater resistance.
See See Figure.
Resistance
Replace AC heater.
38 to 53
Ω?
YES
Replace power board.
AC heater resistance 38 to 53 Ω.
18
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d/dr Fault Code – Door open for more than 2 minutes
Before beginning this procedure make sure:
■
Light/thermistor connector and wire harness connector are fully engaged and locked.
Models and fault indicator displayed.
AC
LAP GAS
AUTO
N62X/N82X
N64X/N84X
Check that the door latch
striker plate is adjusted
correctly.
NO
Striker plate
Adjust striker plate.
okay?
YES
Was door
swing
changed?
NO
Check for correct door
installation. See NOTE below.
Test lamp switch operation. See switch
test procedure below.
YES
Check for location of magnet if the door
swing was changed. See NOTE.
Move tip
Food Compartment Lamp Switch
The reed relay switch that turns the fresh food
compartment light on and off is an integral component
of the optical control display board circuitry.
Magnetic tip screwdriver
Lamp Switch Operation
Lamp Switch Testing Procedure
The magnetic pull from a permanent magnet located
underneath the top door trim maintains the switch
contacts open (light off) when the door is fully closed.
Opening the door breaks the magnetic pull, which in
turn causes the switch contacts close (light on).
1. Slide a magnetic screwdriver tip or a small magnet
on the underside of the optical control assembly
as shown in the figure above.
2. Check the food compartment light as the
screwdriver tip is moved under the display, the
light:
NOTE
a. should turn off when the magnetic screwdriver tip
or magnet passes under the optical control
assembly.
Always follow the instructions provided in the Owner's
Manual to change the refrigerator door swing. The
bottom door trim does not have a magnet. Inverting
the doors will required non-approved modifications and
will cause the fresh food compartment light to remain
on when the door is closed.
b. turn on when the magnetic screwdriver tip or
magnet is distanced from the underside of the
optical control assembly.
3. If the light does not turn off when the magnet
passes under the optical control display, replace
the optical control display assembly.
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Thermistor Failure Fault – Controls in backup operating system mode
Before beginning this procedure:
■
Make sure lamp/thermistor assembly is connected to wire harness.
Models and fault indicator displayed.
Temp
Setting
Flashing
ON
Temp
Setting
Flashing
Flashing once eve
ry 3 seconds
AC
AUTO
LP GAS
GAS
N61X/N81X
N62X/N82X
N64X/N84X
Check lamp/thermistor wire
assembly and connector for
dirty/broken connections.
Wires and
connector
good?
NO
Clean/repair terminals or connector as
required. See Figure A.
YES
Check thermistor resistance.
See Figure B and procedure below.
Temperature*
Resistance*
(k
o
RMS MULTIMETER
( F)
)
87III TRUE
MIN MAX
RANGE
HOLD
H
85
8.1– 9.0
9.1–10.0
REL
Hz
4
1
/
2
D
I
G
I
T
S
P
E
A
K
M
I
N
M
A
X
1
Seconds
mV
mA
V
V
A
Lamp
Connection
µA
80
OFF
A
mA µA
COM
V
75
10.1–11.0
11.1–12.0
12.1–13.0
15.5–16.5
22.5–23.5
24.5–25.5
28.5–29.5
30.0–32.0
!
400mA MAX
FUSED
T
10A MAX
FUSED
1
!
70
60
50
Thermistor
Connections
40
35
33
32
Approximate Values
*
Thermistor
Thermistor packed in ice bath
Figure A.
Figure B.
When a warmer temperature is desired, changing the
temperature setting to a lower number shortens the
cooling cycle. For example, if the temperature setting
is set to 6, lowering the setting to 5 will shorten the
cooling cycle.
Backup Operating System (BOS)
The backup operating system (BOS) is an
electronically controlled duty cycle that maintains the
refrigerator in operation if the thermistor is
disconnected or fails. The BOS maintains cooling by
timing the length of time the heat source is energized.
When the refrigerator is operating in BOS, the length
of the cooling cycle has to be regulated manually
using the TEMP switchbutton.
N61X/N81X Backup Operation.
When the N61X/N81X controls shift to BOS operation,
the ON LED (green) flashes once every three seconds.
N62X/N82XN64X/N84X Backup Operation
When the N62X/N82XN64X/N84X controls shift to BOS
operation, the temperature setting flashes for ten
seconds when the TEMP button is pressed. After ten
seconds, the selected operation mode indicator
displays.
When a colder temperature is desired, changing the
temperature setting to a higher number provides
additional cooling by lengthening the cooling cycle.
For example, if the temperature setting is set to 5,
raising the setting to 6 will lengthen the cooling cycle.
20
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n/no co Fault Code – No cooling detected by the controls
Models and indicator displayed.
ON LED f
lashing
ON
AC
LP GAS
5 times e
very
GAS
3 secon
ds
AUTO
N61X/N81X
N62X/N82X
N64X/N84X
Check for cooling at fin
assembly.
1. Check for ventilation obstructions
and leveled operation.
2. Reset power board as shown in
figure and described in procedure.
3. Allow unit to operate normally.
NO
NO
Cooling
detected?
YES
"no" "co"
code shows
before cycle
end?
Cooling unit is good. Recheck for
ventilation obstructions and leveled
operation.
Check for completion of
cooling cycle after resetting
power board.
1. Replace cooling unit if "no" "co" shows
before completing a full cooling cycle.
2. Reset power board as shown in
figure and described in procedure.
YES
Power Board Resetting Procedure
1. Turn OFF the refrigerator.
2. Disconnect the following from power board:
a. 12 Vdc positive and negative wires.
b. AC power cord.
c. Solenoid gas valve wires.
d. Spark/sense electrode assembly wires.
3. Remove the power board cover.
4. Reconnect 12 Vdc positive and negative wire.
5. Turn ON the refrigerator.
Insulated wire jumper
6. Locate Pin 15 on 16 pin connector (P1). Pin 15 is
the empty socket to the right of the white/violet
wire on the top row. See Figure C.
Pin 16
White/violet wire
To pin 15
Ground Lug
22 AWG with 1/2" long stripped ends
Figure C. Resetting Power Board.
7. Using an insulated jumper wire, short Pin 15 to the
power board ground lug for 10 - 15 seconds. Aclick
sound will indicate when the controls are reset.
See Figure C.
10. Turn OFF the refrigerator.
11. Disconnect the 12 Vdc power positive and negative
wires from the power board.
NOTE
12. Install the power board cover.
13. Reconnect the following to the power board:
a. Spark/sense electrode assembly wire.
b. Solenoid gas valve wires.
A jumper wire to short Pin 15 to ground can be made
from a six inch long insulated 22 AWG wire with a 1/2
inch of insulation stripped from each end.
c. AC power cord.
d. 12 Vdc positive and negative wires from the
power board.
8. Turn OFF the refrigerator.
9. Turn ON refrigerator. If "n" or "no co" code
displays, repeat steps 7 - 9.
14. Place refrigerator in service.
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Errata Sheet, 01/16/04
VENTILATION
Roof Exhaust Venting
The space between the air intake vent and the rear of
the refrigerator must be kept clear at all times. Any
obstruction in this area may cause serious ventilation
problems. The air intake vent opening is also the
access for servicing cooling unit components.
NOTE
The general guidelines for intake vents and roof exhaust
vents presented in this section do not replace the
instructions and/or guidelines provided in the N6XX/
N8XX model refrigerator installation manual and the
Ventilation Guidelines For Gas/Electric Refrigerators,
part number 622090A (3-01). Refer to the N6/N8
installation manual and Ventilation Guidelines For Gas/
Electric Refrigerators for the latest information on
approved vents, installation instructions, and special
construction exceptions.
Roof Exhaust Vent
The heat absorbed by ventilation air and combustion
gases flow out of the enclosure through the roof
exhaust vent. See Figure 3 and Figure 4, page 23.
The roof exhaust vent is equipped with non removable
metal mesh screen that prevent leaves, debris, birds or
rodents from getting into the enclosure. The roof cap is
fastened to the exhaust vent with four screws. The cap
is always installed with the slope towards the front of
the RV.
Air Intake Vent
The ventilation and combustion air flow into the
enclosure through the air intake vent. See Figure 3 and
Figure 4, page 23.
RV front
RV rear
Roof exhaust vent
Exhaust vent screen
Baffle
Full width of enclosure
to isolate the top of refrigerator
from rejected heat
1/4 inch
or less
Condenser
1/8 inch maximum
if wider (see Figure 4)
Absorber coils
1 inch maximum.
If wider, see Figure 5.
Intake vent
Figure 3. Roof Exhaust Venting Arrangement.
22
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Top baffle
Required when the
clearance from the
underside of the roof
to the top of the refrigerator
exceeds 1/4 inch.
Condenser
Side wall baffles
Required when the
clearance between the
enclosure side walls
and refrigerator
exceeds 1/8 inch.
Absorber coils
Intake vent
Figure 4. Rear View–Roof Exhaust Venting.
Angled baffles
Required when the
roof exhaust vent
is inboard of
Baffles
The minimum and maximum clearances for installing
the refrigerator or correcting ventilation problems on
roof vented units are listed in Table 1. Baffles are
required whenever installations exceed maximum
clearances listed in Table 1. Figure 4 shows baffle
locations.
the condenser.
1/4 inch
or less
Condenser
Vertical Angled Baffles
Vertical angled baffles are required when the roof
exhaust vent is installed inboard of the condenser.
Figure 5 shows the angled vertical baffles required on
inboard roof vent installations. The horizontal wall
baffles are required whenever the distance between the
cooling unit and the interior surface of the outside wall
exceeds one inch.
Baffles
Required when
the opening between
the outside wall and
cooling unit is over
1 inch.
Minimum
0 inch
Maximum
0 inch
Bottom
Sides (each)
Top
0 inch
0 inch
0 inch
1/8 inch
1/4 inch
1 inch
Air intake vent
Rear
Figure 5. Baffles Required for an Inboard
Roof Exhaust Vent Installation.
Table 1. Clearances for Roof Vented Installations.
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Double Sidewall Venting
NOTE
An additional challenge with double sidewall venting is
the depth of the enclosure. The deeper the enclosure,
the greater the impact on the air flow through the rear
of the refrigerator. Taking the three key design
considerations and the variable depth requirement into
account, NORCOLD developed and tested several
baffle arrangements for the N6XX and N8XX models
versus their ability to meet the ANSI standards.
The general guidelines for intake vents and roof exhaust
vents presented in this section do not replace the
instructions and/or guidelines provided in the N6XX/
N8XX model refrigerator installation manual and the
Ventilation Guidelines For Gas/Electric Refrigerators
part number 622090A (3-01). Refer to the N6XX/N8XX
installation manual and Ventilation Guidelines For Gas/
Electric Refrigerators for the latest information on
approved vents, installation instructions, and special
construction exceptions.
As the result of this testing, NORCOLD was able to
reduce the baffle configuration down to two baffles for
the N6XX and N8XX models. It should be noted that
baffle arrangements are different if the enclosure depth
is greater or less than 26 inches. The baffle
configurations are shown in Figure 6, page 25, and
Figure 7, page 26.
With increased installation of refrigerators in RV slide
outs. NORCOLD has conducted extensive testing to
develop venting guidelines for double sidewall vent
applications. This work was done to ensure NORCOLD
refrigerators meet the ANSI Z21.19 standards for
cooling performance when used in slide out
applications.
Air Intake Vent
The ventilation and combustion air flow into the
enclosure through the air intake vent. See Figure 6,
page 25 and Figure 7, page 26.
Sidewall Exhaust Vent
The challenge with slide out installations is that the
"chimney effect" that is present with roof vent
installations is not as strong in slide outs. To improve
the "chimney effect" side vent installations must have
fans and baffles. These fans and baffles direct the air
flow through the surfaces of heat rejecting
The heat absorbed by ventilation air and combustion
gases flow out of the enclosure through the sidewall
exhaust vent. See Figure 6, page 25, and Figure 7,
page 26 for details.
components. NORCOLD has determined that the
following three key design considerations optimize
heat removal in slide out applications.
n
Refrigerators installed in slide outs must have a fan
or fans to assist air flow. Fan kits and refrigerators
with factory installed fan(s) are available from
NORCOLD.
n
n
Fresh air must be directed to flow through the
surface areas of the absorber coils, condenser fins,
and the outer surface of the canister.
Corners and structural pockets where heated air
may stagnate must be reduced in size or
completely eliminated.
24
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Figure 6. Baffle Arrangement for Enclosures Depths of More than 24 Inches and Less than 26 Inches.
Refrigerator Service Manual
N6XX/N8XX Models 25
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Figure 7. Baffle Arrangement for Enclosures with Depths of 26 Inches or Greater.
26
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LP GAS SYSTEM
Canister
Flue tube
DC connections
Baffle
Gas valve
Burner tube
Gas inlet fitting
Electrode
Burner
Orifice assembly
(LP16 orifice shown)
Gas outlet fitting
Burner box base
Pressure
test port
Manual shut-off
(shown closed)
RV
LP gas supply
Figure 8. LP Gas System Components.
Pressure Requirements
Testing for LP Gas Leaks
!
!
WARNING:
WARNING:
Do not wet or spray liquids on or near electrical
connections or electronic components. Many liquids,
including leak detection solutions, are electrically
conductive and can create an electric shock hazard,
short electrical components, and/or damage electronic
circuits.
When working on or near the LP gas system:
nDo not smoke or light fires! Extinguish all open
flames!
nDo not use an open flame to leak test any of the
LP gas system components. LP gas is highly
flammable and explosive.
nDo not connect the refrigerator directly to the LP
gas tank. Always use an approved pressure
regulator between the LP gas tank and the
refrigerator LP gas system.
!
CAUTION:
nTo prevent damage to connections, piping, and
components, always use two wrenches to tighten
or loosen connections. Damaged connections,
piping, and components create the potential for
gas leaks.
Do not use leak test solutions that contain ammonia
or chlorine.Ammonia and chlorine attack copper and
brass components.
The refrigerator LP gas system, shown in Figure 8, is
for propane gas use only. The system working
pressure is 10.5 and 11.5 in. water column. Propane
gas pressures below 10.5 in. w.c. or above 11.5 in.
w.c. will affect heat output which in turn will affect
cooling efficiency. Propane gas flow control is
monitored by electronically by the controls flame
sensing circuit. If the flame sensing circuit does not
detect a burner flame within 30 seconds after initiating
ignition, power to the gas valve is turned off and gas
mode is locked out.
Leak testing can be accomplished using an electronic
leak detector or a commercial grade leak test solution.
The use of home made soap and water leak test
solution should be avoided if possible. When applying
leak test solutions, apply the solution over the entire
joint using a small brush or spray applicator.
Due to low system operating pressure, it may take a
few minutes for bubbles to appear if the connection is
leaking. Hidden joints should be examined thoroughly
using an inspection mirror.
Refrigerator Service Manual
N6XX/N8XX Models 27
Errata Sheet, 01/16/04
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Components
When working on the refrigerator LP gas system:
DC connections
Mounting bracket
n
n
Do not alter or modify the burner tube anti-vibration
loop.
Solenoid
Do not cross thread fittings. Exercise extreme care
when connecting and disconnecting propane gas
components.
Gas inlet
fitting
(from RV
LP gas)
Gas outlet
fitting
n
Leak test all of the refrigerator propane gas system
fittings after servicing, replacing, or repairing any
LP gas system component.
Solenoid Gas Valves
Units with serial number 657908 or higher
(manufactured on or after February 16, 1999) are
equipped with the new style solenoid gas valve . See
Figure 9.
Gas pressure
test port
Manual shut-off
(shown closed)
Figure 9. New Style Solenoid Gas Valve.
Units with serial numbers lower than 657908, (models
manufactured before February 16, 1999) are equipped
with the old style solenoid gas valve. See Figure 10.
The electronic controls automatically operate the
solenoid gas valve.
New Style Solenoid Gas Valve
The new style solenoid gas valve manual shut off and
pressure tap are integrated in the valve’s body. The
valve's manual shut-off is a spring-loaded, quarter turn
manually operated valve.
Solenoid
DC connections
Gas
Gas valve
To manually shut-off gas to the burner, pull the handle
slightly away from the body, then turn it one-quarter
turn (90 degrees) counterclockwise.
pressure test port
Gas outlet
fitting
Old Style Solenoid Gas Valve
Refrigerators with serial numbers lower than 657908,
(models manufactured before February 16, 1999) are
equipped with the old style solenoid gas valve. See
Figure 10.
Gas inlet
fitting (from
RV LP gas system)
Use a NORCOLD® gas valve conversion kit, part
number 621334, to replace an old style solenoid gas
valve assembly.
Manual shut-off
(shown open)
Mounting bracket
Solenoid Gas Valve Connections
The solenoid gas valve inlet fitting is 3/8 inch, male
threads; the outlet fitting is 1/4 inch, male threads.
Figure 10. Old Style Solenoid Gas Valve.
28
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Orifice
The orifice controls the flow of propane gas to the
burner. When replacing the orifice always use the size
orifice specified. Using the wrong size or a damaged
orifice will alter the amount of propane flowing to the
burner.
0.155 Jeweled orifice assembly
N62X/N64X units with serial number 886961 and higher
and N82X/N84X units with serial number 889988 and
higher are equipped with an LP16 cap type orifice. All
other units with serial numbers lower than those listed
were originally equipped with an 0.155 jeweled orifice.
See Figure 11.
1
6
L
P
Cap type LP16 orifice assembly
Figure 11. 0.155 and LP16 orifice assemblies.
!
WARNING:
Do not separate cap style LP16 orifice from its adapter.
Separating the assemblies breaks the seal and
causes an LP gas leak.
!
WARNING:
Do not use compressed air to clean a jeweled type
orifice. The air pressure may dislodge the orifice from
the adapter.
!
CAUTION:
Do not install cap style LP16 orifice in a burner that
uses a jeweled type orifice or vise versa. The orifice
adapter's threads are not compatible. Each orifice
must be matched to its burner.
Figure 12. Burner.
Burner
The burner, see Figure 12, provides primary air access
and acts as the fuel mixing chamber to support
ignition and the combustion of propane gas. Primary
combustion air flows into the burner through three
circular openings. Any obstruction blocking any of the
three openings will have an effect on the fuel/air
mixture. Insufficient combustion air will cause carbon
deposits to clog the burner slots. Carbon clogged
burner slots along with heavy dirt deposits in the
burner are the main cause of no cooling or poor
cooling performance when the refrigerator is operating
in LP gas mode.
Burner connection
Burner Tube
Gas valve connection
The burner tube is 1/4 inch OD aluminum tubing with
an anti-vibration loop and a double flare at each end.
See Figure 13.
Figure 13. Burner tube.
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Flue
The flue on all N6XX/N8XX terminates a few inches
above the canister. See Figure 14. The flue comes
equipped with a removable baffle ("spiral baffle") and a
metal heat deflector.
Heat deflector
The flue and its components should be checked
annually. In roof exhaust venting applications, the
refrigerator must be removed from the enclosure to
check or service the flue or any of its components.
Flue
Baffle retaining
wire
In most sidewall exhaust venting applications, removal
of the side wall exhaust vent provides clear access to
service the flue or any of its components.
Baffle
Burner box
A one inch diameter, loop-handle, twisted wire brush
with a 27 inch wire handle is recommended for
sweeping clean the flue.
Figure 14. Flue and Components.
Heat Deflector
The heat deflector, see Figure 14, deflects hot exhaust
gases to the sides. It also keeps dirt and debris from
getting into the flue. Cooling performance may be
affected if the heat deflector is not installed or is not
installed correctly.
Retaining wire
Spiral Baffle
The spiral baffle, see Figure 14, traps and transfers
heat to the cooling unit generator.
A retaining wire suspends the spiral baffle in the flue
just above the flame. See Figure 15. The spiral baffle
should be checked annually. To remove the spiral
baffle from the flue:
1. Remove the heat deflector.
2. Unclip the baffle retaining wire from the rim of the
flue.
Baffle
3. Pull the baffle out of the flue tube.
!
CAUTION:
Figure 15. Flue Baffle.
Do not cut or modify the spiral baffle retaining
wire! The wire positions the baffle for optimal heat
transfer.
Light blue steady flame
with sharp blue cones
Flame Appearance
The flame should be light blue with sharp blue root
cones and a steady burning flame plume. See Figure
16.
A flame that is mostly orange or yellow, is erratic, and
unstable, indicates a "dirty" burner. Burner cleaning
procedures appear on page 30.
Figure 16. Flame Appearance.
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Burner Cleaning Procedure
!
!
CAUTION:
WARNING:
Do not use compressed air to clean a jeweled type
orifice. The air pressure may unseat the jewel orifice
insert from the adapter.
Burn hazard! Allow the burner box and burner
components to cool before attempting to service the
burner assembly or components.
11. Visually inspect the orifice. If dirty, wash the
assembly with alcohol then allow to air dry.
Replace the orifice assembly if the cleaning fails to
remove dirt or if the condition of the orifice
assembly is questionable.
1. Turn OFF power to the refrigerator.
2. Close the LP gas tank valve.
Step 3 through Step 5, refer to Figure 17, page 32
12. Clean any accumulation of dirt or debris from the
burner box base.
3. Close the combination gas control valve manual
shut-off.
13. Reinstall the burner. Do not over tighten the
burner's retaining screw.
4. Remove the drip cup.
!
CAUTION:
To prevent damage to connections, piping, and
components, always use two wrenches to loosen the
burner tube. A damaged burner tube creates a
potential for gas leaks.
!
CAUTION:
To avoid gas leaks and prevent damage to
connections, piping, and components, always use
two wrenches to tighten the burner tube. Adamaged
burner tube creates a potential for gas leaks.
5. Remove the burner box cover.
14. Install the orifice assembly. First thread the orifice
assembly into the burner finger tight, then finish
tightening using two wrenches.
Step 6 through Step 8, refer to Figure 18, page 32
6. Disconnect the burner tube from the orifice
assembly.
15. Connect the burner tube. First thread the fitting
finger tight, then finish tightening using two
wrenches.
7. Remove the orifice assembly from the burner.
8. Remove the burner retaining screw.
9. Remove the burner from the burner box frame.
10. Clean the burner.
16. Install the burner box cover. Do not overtighten the
cover retaining screw.
17. Open the LP gas tank valve.
18. Open the solenoid gas valve manual shut-off.
NOTE
19. Turn ON the refrigerator and select LP manual
mode operation.
The burner slots may be cleaned with a small flat
file. The inner bore of the burner body may be cleaned
with a 3/16 in., double-spiral wire brush. Do not
damage the threads when cleaning the inner bore of
the burner.
20. Leak test LP gas connections during the 30
second trial-for-ignition.
!
WARNING:
Do not attempt to repair LP gas leaks with the
refrigerator in operation. Before attempting to repair a
gas leak:
NOTE
Do not insert any type of cleaning tool or wire into the
orifice. Do not drill or ream the orifice opening to clean
it. Insertion of any type of cleaning tools, reaming, or
drills through the opening will alter the volume of LP
gas flow to the burner and create a fire hazard potential.
nTurn OFF the refrigerator.
nClose the LP gas valve and the solenoid gas valve
manual shut-off.
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Figure 17. Drip Cup and Burner Box Cover.
Canister
Flue
Baffle
Burner
tube
Electrode
Burner
Orifice adapter with LP16 orifice
Figure 18. Burner and Components.
32
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ELECTRICAL REQUIREMENTS AND COMPONENTS
DC Voltage Requirements and Polarity
DC Heater–3-Way Refrigerators Only
Operating controls require 10.5 to 15.4 Vdc to operate.
The positive wire lead (+) connects to power board
terminal 12VDC; the negative wire lead (–) connects to
terminal GND1.
!
WARNING:
Do not wire the heater(s) direct! Wiring heater(s)
direct bypasses control safety devices and creates
the potential for an electrical fire.
Power Board DC Fuse
!
WARNING:
The DC heater, shown in Figure 19, is a cartridge type
heater. The DC heater is rated for 225 Watts/16 amps,
at a nominal 14 Vdc. Heater resistance should be
0.82 - 0.91 ohms.
Never replace a fuse with a higher amp rated fuse.
Always use the specified fuse.
The controls circuit fuse is a standard 5 amp (tan
color) automotive blade type fuse. It is located on the
power board, terminal F1.
NOTE
The AUTO DC and DC-Manual Mode operation
maintain refrigeration only.
DC Power Wiring Requirements
!
WARNING:
Never use undersized wires to supply DC power to
the power board. The use of undersized wires can
cause low voltage and high amp draw conditions. The
high amp draw caused by a circuit using undersized
wires will cause the wire to overheat and creates an
electrical fire hazard.
Stop Bead
2-Way Models
Yellow Wire Leads
18 AWG is the minimum AWG size wire that can be
used for connecting DC power to 2-way models. The
size fuse for overload protection must not exceed 6
amps.
Figure 19. DC Heater
3-Way Models
When AUTO DC or DC-Manual Mode does not
maintain refrigeration and ventilation is correct:
The distance between the RV DC power source and
the power board DC power connection terminals
dictates the AWG size wire that must be used. If the
distance from the DC power source is:
n
n
n
Measure DC voltage input to the power board.
Measure the heater's amp draw.
If amp draw is not as specified, measure the
heater's resistance at ambient temperature.
n
20 feet or less – 10 AWG or a larger gauge wire
must be used. The size fuse for circuit overload
protection must not exceed 30 amps.
The DC heater must be inserted into the heater tube
until the stop bead makes full contact with the tube's
rim. See Figure 20, page 34.
n
Over 20 feet –AWG 8 or a larger wire gauge must
be used. The size fuse for circuit overload
protection must not exceed 40 amps.
DC Heater Circuit Fuse
AC/DC Converter as Power Source
The power board must be supplied 12 Vdc only from
the filtered output (battery side) of a converter.
!
WARNING:
Never replace a fuse with a higher amp rated fuse.
Unfiltered voltage (commonly referred to as AC ripple)
output of AC/DC converters can cause the electronic
controls to set false fault codes. It can also turn off the
refrigerator or prevent the refrigerator from turning off.
Always use the specified fuse.
The DC heater circuit fuse is a standard 30 amp
(green) automotive blade type fuse. It is located on the
power board, terminal F2.
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AC Power Requirements
DC Heater
AC Heater
!
WARNING:
Electric shock hazard! The refrigerator is fed power
from more than one source. Unplug theAC cord from
the RV AC receptacle before servicing electrical or
electronic components.
AC Heater Tube
DC Heater Tube
AUTO AC and AC-Manual Mode operation requires 108
to 132 Vac. AC power must be supplied through a 2
pole/3 wire/20 amp grounding type receptacle.
Canister Door
AC Heater
Figure 20. AC and DC Heaters (3-way refrigerator)
!
WARNING:
Lamp Assembly
Do not wire the heater(s) direct! Wiring heater(s)
direct bypasses control safety devices and creates
the potential for an electrical fire.
The operation of the fresh food compartment 12 Vdc
lamp is controlled by a magnet activated reed relay
switch. The switch is in the optical control circuit
board and the magnet is permanently mounted on the
underside of the door's top trim piece.
The AC heater, see Figure 22, is a cartridge type
heater. Refrigerators with serial number lower than
854647 heater is rated for 300 Watts/2.7 amps @ 110
Vac and has a resistance of 41.25 ohms. Refrigerators
with serial number 854647 and higher heater is rated
for 300 Watts/2.5 amps @ 120 Vac. Heater
resistance is 48 ohms.
Leaving the door ajar or open for more than two
minutes causes the controls to display a "d" or "dr"
fault code (depending on unit model). Closing the door
turns off the light and clear the "d" or "dr" fault
indicator from the display. However, the fault code will
be stored in the diagnostic mode nonvolatile memory.
For "d"/"dr" troubleshooting procedures. See page 19.
As shown in Figure 21, the light assembly harness
and thermistor share the same connector. Remove the
light cover to access the connector.
Stop Bead
Connector
Light bracket
Lightbulb
Black Wire Leads
Light cover
N641/N841
Figure 22. AC Heater.
When poor or no cooling in AUTO AC or AC-Manual
Mode, operation is present:
Thermistor
1. MeasureAC voltage input to the power board.
2. Measure heater amp draw.
Clip
Figure 21. Lamp/Thermistor Assembly.
3. If amp draw is not as specified, measure the
heater's resistance at ambient temperature.
Divider Heater
The divider heater is permanently "foamed" between
the divider separating the freezer and fresh food
compartment. The controls constantly monitor power
board voltage output to the heater through built in
diagnostics. Turning the refrigerator on automatically
powers the heater.
When replacing an AC heater make sure the stop bead
rests fully against heater tube rim. See Figure 22.
AC Heater Circuit Fuse
1
1
The AC circuit fuse is a fast acting 5 amp /4" x 1 /4"
AGC type. It is on the power board, terminal F3.
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AC Power Cord
(b)
The AC power cord shown in Figure 23(a) is used on
units without ice maker. On all AC power cords the
round side of the plug that connects to the power
board faces the left side of the power board. The cord's
grounding prong on the AC outlet connector must be
left intact and never be modified or cut. The cord's
ground wire (green wire) must always be fastened to
the refrigerator cabinet metal plate.
Smooth black lead
to black ice maker wire
(a)
Ribbed black lead
to white ice maker wire
Ground wire
Power Cord for Ice Maker Units
REFRIGERATORS WITH ICE MAKERS
The AC power cord shown in Figure 23(b) is used on
N64X IM and N84X IM units (IM = ice maker). The cord
has two short wire leads originating at the rear of the
power board connector plug to connect the ice maker
wire harness black and white leads. The short ribbed
wire is the line voltage lead, it has a female quick-
connect type terminal. The smooth wire is the neutral
lead, has a male quick-connect type terminal. Refer to
pages 71 and 72 for ice maker wiring pictorials and
diagrams.
Ground wire
REFRIGERATORS WITHOUT ICE MAKERS
Figure 23. AC Power Cord.
Fan mounting screws
All N643IM and N843IM units are equipped with an
independent AC power cord (white in color) to supply
120 Vac to the ice maker only.
12 Vdc Ventilation Fan
The 12 Vdc ventilation fan, shown in Figure 24,
enhances ventilation in sidewall venting installations
(unit installed in RV slide out enclosures). The letter
"F" in a model number is used to identify refrigerators
with a factory installed 12 Vdc ventilation fan. All
sidewall vented units must be equipped with a
ventilation fan to prevent combustion gases and hot
ventilation air from stagnating in the enclosure.
Outer bracket and mounting screws
Ventilation fans are supplied 12 Vdc through power
board connections. Fan operation is automatically
controlled by a thermostatic switch mounted on the
first condenser fin. See Figure 25. The switch turns the
fan on when the temperature on the first condenser fin
is approximately 130 °F. The switch turns the fan off
when fin temperature falls to approximately 115 °F.
Figure 24. Fan Mounted on Top of Absorber Coil.
+ 12 Vdc input to thermostatic switch
Fan thermostatic switch
NORCOLD® fan kit is wired to the power board 12 Vdc
connections using "Y" type wire connector. The fan
circuit is protected by an in-line fuse (included in the
kit). The fuse, part of the fan kit wiring is a fast acting
1
1 amp,1/4” x 1 /4” AGC type. See Figure 26. The wiring
pictorial for field installed fan is shown in Figure 27,
page 36.
+12 Vdc wire to fan connection
Figure 25. Fan Thermostat.
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Fan thermostatic
switch
THERMOSTAT
Red
Wire
Red
Wire
Black
Fan
Wire
Red
Fan
Wire
Black
Wire
Fan
1AMP
FUSE
FAN
Black Spliced Wire
Red Spliced Wire
POWER BOARD
12 VDC
GND1
1 amp
in-line fuse
- 12 Vdc connection
+ 12 Vdc connection
12 Vdc
12 Vdc
Figure 26. Fan with Wiring Arrangement for Field
Installed NORCOLD Fan Kit.
Figure 27. NORCOLD Fan Kit Wiring Pictorial.
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COOLING UNIT
Description
Gradual Decrease in Cooling Efficiency
The cooling unit is a self-contained gravity flow
absorption refrigeration system. The refrigerant charge
is a solution of water, ammonia, sodium hydroxide,
and sodium chromate (a corrosion inhibitor).
Refrigeration is accomplished by applying heat energy
and venting the heat extracted from the freezer and
fresh food cabinet while maintaining the unit leveled.
A gradual decrease in cooling efficiency is not a clear
indication of cooling system failure. Other factors that
affect cooling efficiency include ventilation, the heat
input, off-level operation, lack of service and
maintenance, inadequate repairs, or unauthorized field
modifications. If any of these factors exist and are not
corrected, a replacement cooling unit will also perform
inefficiently or fail.
Heat Absorption
Step-by-step troubleshooting is the best approach
when dealing with a gradual decrease in cooling. It is
important to consider is that, though not efficiently, the
cooling unit is working. Troubleshooting should always
begin by checking ventilation, then thoroughly
checking the cooling unit, and heat sources. In the
majority of reported case, the problem has been
related to the installation, which in turn hindered
cooling unit ventilation.
The refrigerant transfers the heat from the freezer and
the food cabinet to the absorber coils. At the absorber
coils the metal surface absorbs the heat and air flow
over the external surfaces of the coils and carries
away the heat. A thermal air current created by the
rising hot air flows out of the enclosure through the
roof exhaust vent or sidewall exhaust vent (depending
on installation). The flowing air mass passes over the
surface of the condenser fins where it absorbs heat
transferred from the ammonia vapors flowing through
the condenser.
Additionally, ambient air temperature plays a
significant role if the unit was not installed correctly.
Incorrect installation lead to poor ventilation, which in
turn relates to poor cooling performance.
The thermal airflow process creates a "chimney
effect". The "chimney effect" creates a continuous
draft of cooling and combustion air. The fresh air
drafted by the "chimney effect" though the intake vent
removes rejected heat, support combustion, and
expels the exhaust gases produced by the combustion
process. Obstructions, restrictions, or modifications to
vents or the enclosure will affect the heat absorption
cycle. Poor cooling unit performance may be due to:
The unit's service and maintenance history should be
considered when checking a cooling unit for poor
cooling performance. The service history and the
scope of service work performed may lead directly to
cause and resolution of a cooling problem.
The cooling unit has to reach normal operating
temperatures before troubleshooting can take place. It
takes an average of four hours for the refrigerant to
reach normal operating temperatures. The time frame
to reach operating temperatures depends on ambient
air temperature.
n
Loose insulation interfering with the ventilation
process.
n
Construction material or debris left in the
enclosure.
n
n
n
n
n
Insect screen covering vents.
Cooling System Monitoring
The controls monitor cooling system performance
when a heat source is active. If the controls sense that
.
the system is not cooling, it displays a fault code ("n"/
Plastic sheeting covering vents.
Items stored in the enclosure.
Modifications to vents or enclosure.
No roof or sidewall exhaust vent opening.
"no" "co") and locks out all heat energy sources.
Information pertaining to ventilation and enclosure
requirements appears on page 22.
First "No Cooling" Fault Occurrence
Users can reset the controls by turning the refrigerator
off then back on. The user resetting option can only be
accomplished when the controls record the first "no
cooling" ("n"/"no" "co") fault occurrence. The
completion of a full cooling cycle will remove the
recorded first "n"/"no" "co" fault from memory and
returns the controls to normal monitoring operation.
Leveled Operation
The circulation of the refrigerant through the cooling
unit is accomplished by gravity flow; therefore, the
refrigerator must be operated leveled. Off-level
operation affects the flow of the refrigerant through the
cooling system. The maximum off-level operation limits
are:
Two Recorded "No Cooling" Fault Occurrences
If the controls detect two consecutive recorded "no
cooling" faults , the "n"/"no" "co" fault code displays
and the controls will lock out all heat sources (AC/LP/
DC). The power board can then only be reset by an
authorized service center after troubleshooting and
testing cooling system operation. See Page 21.
n
n
3 degrees from side-to-side.
6 degrees from front-to-back.
Exceeding the maximum off-level limits can
permanently damage the cooling unit.
The cooling unit or its performance are not affected
when the vehicle is in motion
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Troubleshooting Cooling Faults
A high percentage of cooling units returned labeled
“faulty” are fully operational units. The flowchart on
page 38 provides information to troubleshoot cooling
unit related faults.
Poor or No Cooling on DC Mode – 3-Way Models
!
WARNING:
Do not work on live circuits! Turn offAC power and
DC power before attempting to remove, service, or
repair any of the refrigerator's electrical or electronic
circuits or components.
Poor or No Cooling on AC Mode
!
WARNING:
When troubleshooting poor or no cooling in AUTO DC
or DC-Manual Mode, always check DC voltage input to
the power board, voltage output to the heater, and
heater amperage draw. If DC voltage input to the
refrigerator is lower than 12 Vdc, the problem is
usually related to the DC power supply source. The RV
DC power supply source may not be supplying the
correct voltage to the power board.
Do not work on live circuits! Turn off and disconnect
AC power and DC power supplies before attempting
to remove, service, or repair any of the refrigerator's
electrical or electronic circuits or components.
When troubleshooting poor or no cooling in AUTO AC
or AC-Manual Mode, first check AC voltage input to the
power board, then check voltage output to the heater,
and the heater's amperage draw.
The diagnostic flowcharts on pages 13, 14, and 15 of
this manual provide information to troubleshoot DC
power faults.
AC voltage problems, high or low voltages, caused by
the RV AC power supply circuit. To troubleshoot AC
faults, refer to the diagnostic flow charts on pages 16,
17, and 18 of this manual.
!
WARNING:
Do not operate the refrigerator if the cooling unit is
Poor or No Cooling on LP Gas Mode
leaking or leakage is suspected.
Refrigerant Leakage
!
WARNING:
Yellow powder or liquid deposits at the rear of the
refrigerator or ammonia smell inside the refrigerator
indicate refrigerant leakage. Exercise extreme care
when handling a leaking or a suspected leaking
cooling unit. The cooling system refrigerant solution
consists of water, ammonia, sodium hydroxide, and
sodium chromate.
LP gas (propane) is highly flammable and
explosive! Do not smoke, light fires, or create sparks
when working on the LP gas system.
Do not use an open flame to leak test any propane
gas system component.
Disposal of Cooling Unit
When troubleshooting poor or no cooling in AUTO LP
mode or LP-Manual Mode, always check the burner
flame appearance first. Most faults on LP gas
operation related to a "dirty burner."
Dispose of cooling unit according to local, state, and
federal guidelines and regulations. Dispose of any
liquid waste or residue, according to pre-emergency
planning and all applicable local, state, and federal
regulations.
The diagnostic flowchart on page 12 of this manual
provides information to troubleshoot the no flame
faults.
Do not, under any circumstances, release any waste
or residue directly into sewers, or surface waters. If
any liquid leaks or spills from the cooling unit, contact
the nearest environmental services for guidance.
38
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Cooling System Diagnostic Flowchart
!
WARNING:
Do not bypass or modify the refrigerator’s controls
or components to diagnose the cooling system. Do
not wire the heater(s) direct. The heater is supplied
power through a fused circuit.
!
WARNING:
Check cooling unit.
Do not operate the refrigerator if the
cooling unit is leaking or a leak is
suspected.
Signs of leak(s):
■
YES
Yellow residue inside or at the rear of the
Any signs of leak?
Replace cooling unit.
refrigerator.
■
Ammonia smell.
NO
Ventilation as
per installation
instructions?
NO
YES
Correct ventilation to meet
.
Check heat input.
installation requirements
NO
Heat input device
operating within
specification?
Correct heat input device to
meet specifications
.
Check (as required):
■
AC heater voltage and amp draw.
DC heater voltage and amp draw.
(3-way units only).
■
YES
■
■
Burner, orifice, flue, deflector cap, flue baffle.
LP gas pressure.
Level refrigerator as outlined
in Owner's Manual and
specifications.
Refrigerator
operating leveled?
NO
Maximum off-level limits:
■ 3 degrees side to side.
■ 6 degrees front to back.
YES
Continued on page 40.
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!
WARNING:
Do not operate the
refrigerator if the cooling unit
is leaking or a leak is
suspected.
From page 40.
Check condition of door gaskets.
NO
Repair/replace door as
required.
Door gaskets
sealing properly?
YES
Recheck cooling unit for leaks.
Visual and audible signs of leak(s):
■
YES
Any signs of
leakage present?
Yellow residue on the rear of the refrigerator.
Replace cooling unit.
■
Ammonia smell.
■
Gurgling noise (not always present.
NO
Cooling unit performance test:
1. Disconnect thermistor from the wire harness.
2. Set temperature setting to the coldest setting.
3. Place thermometer in freezer.
Test test cooling unit
performance.
4. Allow unit to operate for 3-4 hours.
5. Measure temperature.
The back of the freezer plate
should be cool after 3-4 hours of
continuous operation.
NO
Cooling detected?
Replace cooling unit.
YES
Temperatures given below are based on 90 °F ambient
temperature, correct ventilation, and operation at coldest
Refrigerator
temperatures
YES
Unit is operating normally.
setting for a period of 8-12 hours.
■
normal
?
Freezer -5
°
F to -10 °F.
■
Fin temperature 18 °F to 25 °F.
NO
Check thermistor and
power board operation.
40
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Replacing the Cooling Unit
Cabinet
Freezer plate
Fin assembly
Condenser
Foam block
Absorber
Canister door
Heat deflector
Canister
Combustion seal
Leveling chamber
Burner box
DC heater (3-way units only)
AC heater
Burner box window
Figure 28. Cooling Unit and Components.
5. Disconnect the RV LP gas supply line from the
gas valve.
NOTE
This procedure supplements the instructions packaged
with N6XX/N8XX models replacement cooling units.
Follow the procedure thoroughly to install the cooling
unit correctly. Incorrect installation, adjustments, or
modifications will affect cooling performance.
N64XIM/N84XIM (ice maker)
a. Close the water supply valve to the ice maker.
b. Disconnect the RV water supply line from the ice
maker water valve.
Removing the Refrigerator from the Enclosure
6. Remove two retaining screws from the bottom trim
piece, then remove trim piece. See Figure 31, page
44.
Refer to Figure 28 to locate components.
1. Close the LP gas tank valve(s).
7. Remove two retaining screws from the bottom of
the cabinet. See Figure 31, page 44.
2. Disconnect the AC power cord from the RV
receptacle.
8. Remove two hole plugs from the top trim. See
Figure 32, page 44.
3. Turn OFF RV DC power to the refrigerator.
4. Disconnect the DC power supply wires from the
power board.
9. Remove two top cabinet retaining screws. See
Figure 32, page 44.
Refrigerator Service Manual
N6XX/N8XX Models 41
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16. Remove the thermistor from the 10th fin.
Removal of Cooling Unit
N64XIM/N84XIM (ice maker)
17. Remove eight retaining screws along with washers
from the freezer plate.
15. Remove four retaining screws from the fin assembly.
a. Remove the ice maker water line.
16. Cut or remove the tape around the edge of the foam
plug.
b. Disconnect the ice maker wire harness wires
(white and brown wires) from the water valve
solenoid.
17. Remove two absorber bracket retaining screws.
18. Separate the cooling unit from the refrigerator
cabinet. To separate:
c. Disconnect the ice maker wire harness ground
wire.
a. Grab the cooling unit by the liquid heat exchanger.
d. Move the wire harness out of the way.
e Remove the water valve.
b. Pull cooling unit upward at a slight angle to
unseat the foam plug.
19. Remove the condenser retaining screw. See Figure
29, page 43.
N62XF/N82XF/N64XF/N84XF (fan models)
20. Pull the cooling unit from the cabinet.
Installation of Replacement Cooling Unit
NOTE
• Remove the fan, bracket, thermostat, and wiring
from the cooling unit.
1. Remove the drip cup retaining screw, then remove
the cup.
2. Remove the burner box cover retaining screw, then
remove the cover.
The sealant must be applied correctly to prevent air
from being drawn into the cooling unit's high and low
evaporators.
3. Disconnect the burner tube from the gas valve at the
gas valve.
4. Remove the burner retaining screw.
1. Clean the old sealant from the back of the
evaporator plate, fin assembly, cooling unit, and
the cabinet step.
5. Remove the burner tube and burner from the burner
box.
6. Disconnect the gas valve wires from the power
board.
2. Apply a 1/2 inch bead of sealant to the cooling unit
low and the high temperature evaporators, and to
the foam plug step. See Figure 30.
7. Remove the gas valve assembly (including bracket).
8. Loosen the spark/sense electrode assembly
retaining screw and remove the assembly from the
burner box.
3. Mate the cooling unit foam plug section with the
cabinet step opening. The foam plug must seat
evenly against the cabinet step.
10. Remove the rear mounting flange screws.
11. Pull the refrigerator from the enclosure.
4. Fasten the condenser section to the cabinet. Do
not overtighten the condenser retaining screw
Figure 29, page 43.
12. Remove the burner box retaining screws, then
remove the burner box.
5. Fasten the freezer plate to the cooling unit (eight
screws with washers). Do not overtighten the
freezer plate screws.
3-way refrigerators (AC/LP/DC)
6. Fasten the fin assembly to the cooling unit (four
• Disconnect the DC heater wire leads from power
board terminals FLP/DC HEAT and DC_HT GND.
screws). Do not overtighten fin screws.
7. Attach the thermistor to the 10th fin (counting from
right to left).
13. Disconnect theAC power cord from the power
board.
8. Fasten the absorber section of the cooling unit to
the cabinet (two screws). Do not overtighten
retaining screws.
14. Remove the power board cover retaining screws,
then remove the cover.
9. Tape the edge of the foam plug to the cabinet . Use
HVAC metallic tape or heavy duty duct tape.
15. Disconnect theAC heater wires from power board
terminalsAC_HT -LO1 andAC_HT_HI.
N62XF/N82XF/N64XF/N84XF (Fan models)
3-way refrigerators (AC/LP/DC)
•
Reinstall the fan bracket, fan, thermostat, and
wiring. See wiring diagram on the outer surface of
the fan bracket or refer to Figure 27, page 36.
•
Remove DC heater (3-way models only). Retain
the heater for reinstallation.
42
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N64XIM/N84XIM (ice maker)
a. Reinstall the ice maker water valve.
b. Reconnect the ice maker water line.
Condenser retaining screw
3
/
4
in.
to
c. Connect the brown and the white wires to the
water valve solenoid terminals.
1
1
/
in.
4
10. Install the burner box.
11. Install the burner tube and burner assembly. Do not
overtighten fittings.
Figure 29. Condenser Angle and Retaining Screw.
13. Install the gas valve and connect the burner tube
to the valve. Do not overtighten fittings.
14. Install the spark/sense electrode assembly. Set
electrode-to-burner air gap 1/8 to 3/16 inch.
15. Install the burner box cover.
16. Connect theAC heater wires to power board
terminalsAC_HT -LO1 andAC _HT _HI.
Low temp
evaporator
1/2 in. bead
of sealant
3-way refrigerators (AC/LP/DC)
a. Install DC heater into tube.
b. Connect heater wires to terminals FLP_DC
HEAT and DC_HT_GND.
Foam plug step
1/2 in. bead
of sealant
17. Reinstall the power board cover.
High temp
18. Connect the gas valve wires to the power board
terminals GV and GV_GND.
evaporator
1/2 in. bead of
sealant
19. Plug theAC cord into the power board.
20. Connect the spark/sense electrode assembly to
the power board.
Figure 30. Application of Sealant.
Refrigerator Service Manual
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Reinstallation of Refrigerator into Enclosure
Cabinet retaining screws
!
WARNING
Do not install the refrigerator if the combustion seal
has been damaged.Adamaged combustion seal must
be replaced. The seal isolates the living area of the
vehicle from exhaust gases generated by LP gas
combustion. LP gas exhaust gases contain carbon
monoxide, which is an odorless, colorless gas that
can cause dizziness, nausea, or in extreme
concentrations, death
Trim retaining screws
Bottom trim piece
1. Check the condition of the combustion seal.
Replace seal if damaged. Do not install the
refrigerator if the combustion seal is damaged.
Figure 31. Bottom trim and retaining screws.
2. Place the refrigerator in the enclosure. The
combustion seal must seat fully against the
enclosure wall.
Cabinet retaining screws
3. Attach the bottom of the cabinet to the enclosure.
See Figure 31.
4. Reinstall the bottom trim piece. See Figure 31.
5. Secure the top of the cabinet with two screws and
install hole plugs. See Figure 32.
6. Secure the back of the cabinet to the enclosure
floor with two screws.
N64XIM/N84XIM (ice maker)
a. Connect the water supply line to the ice maker
water valve.
Hole plugs
b. Open the water supply to the ice maker.
Figure 32. Top retaining screws and hole plugs.
7. Connect the RV LP gas supply line to the gas
valve inlet fitting.
8. Open the solenoid gas valve manual shut-off.
9. Plug the refrigeratorAC power cord to the RV
receptacle.
10. Connect the RV DC power supply wires to power
board terminals 12VDC and 12V_GND1.
11. Open the LP gas tank valve(s), then leak test LP
gas connection at solenoid gas valve.
12. Leak test the burner solenoid gas valve and orifice
assembly burner tube connections.
44
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ELECTRONIC COMPONENTS
N61X/N81X Power board
Inputs, outputs, monitoring, and diagnostic functions
are managed and controlled by the power board.
Inputs, outputs, monitoring information, and diagnostic
functions are communicated through the optical control
assembly. The wire harness interfacing the power
board with the optical control assembly is "foamed"
into the cabinet. Wiring pictorials and schematics can
be found on page 46, 47 and 48.
Power Board
5 A Fuse
AC Power (F3)
AC Heater
Terminals
Wire Harness
Connector (P1)
5 A Fuse
DC Power (F1)
The power board is seated on an insulated base to
prevent the printed circuit from making contact the
refrigerator's cabinet metal plate. Power boards seated
in bases are shown in Figure 33.
N62X/N82X Power board
Two, self-tapping 1/4 inch hex head screws hold the
power board and base in place. The power board cover
is held by three self-tapping 1/4 inch hex head screws.
The power board cover and external connections are
shown in Figure 34.
Removal–Power Board
1. Turn OFF refrigerator.
2. Turn OFF RV DC power to the refrigerator.
3. Disconnect DC power supply wires from power
board terminals 12 VDC and 12_VGND1.
5 A Fuse
AC Power (F3)
AC Heater
Terminals
Wire Harness
Connector (P1)
5 A Fuse
DC Power (F1)
3-way refrigerators (AC/LP/DC)
• Disconnect the DC heater wires from terminal
FLP/DC HEAT and DC_HT GND.
N641/N841: 2-Way Power board
4. Unplug theAC power cord from the RVAC
receptacle.
5. Unplug theAC cord from the power board.
6. Disconnect the gas valve wires from power board
terminals GV and GV_GND.
7. Disconnect the spark sense electrode wire.
N64XIM/N84XIM (ice maker)
5 A Fuse
AC Power (F3)
AC Heater
Terminals
Wire Harness
Connector (P1)
5 A Fuse
DC Power (F1)
• Loosen the water valve bracket, then move the
bracket/water valve assembly out of the way.
N641/N841: 3-Way Power board
8. Remove the three, 1/4 inch self-tapping hex head
screws from the power board cover.
9. Remove the power board cover.
10. Disconnect theAC heater wires from power board
terminalsAC_HI andAC_LO.
11. Disconnect the wire harness connector from power
board, terminal P1.
12. Remove two, 1/4” hex head screws, then remove
the power board along with its base.
5 A Fuse AC Heater Wire Harness DC Heater 30 A Fuse 5 A Fuse
AC Power Terminals
(F3)
Connector
(P1)
Terminals DC Power DC Power
(F1) (F1)
Figure 33. N6XX/N8XX Power Boards
N6XX/N8XX Models 45
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Installation–Power Board
1. Seat the power board in the base.
2. Attach the power board and base assembly to the
refrigerator using two, 1/4 in. self-tapping hex head
screws. Do not overtighten screws.
+12 Vdc
Wire Lead
-12 Vdc
Wire Lead
DC Heater
Wire Leads (3-
way units only)
3. Connect the wire harness connector to the power
board, terminal P1.
4. Connect theAC heater wires to terminalsAC_HI
andAC_LO.
5. Position and align the power board cover over the
power board. Attach the cover using three, 1/4 in.
self-tapping hex head screws. Do not
overtighten screws.
6. Connect the solenoid gas valve wires to terminal
GV and GV_GND.
AC
Power Cord
AC Heater
Wire Leads
Solenoid Gas Valve
Wire Leads
Spark/Sense
Electrode Assembly
Wire Lead
7. Connect the spark/sense electrode wire to the
power board high tension terminal.
Figure 34. Power Board, 3-Way with Cover
3-way refrigerators (AC/LP/DC)
• Connect the DC heater wires to power board
terminals FLP/DC HEAT and DC_HT GND.
8. Connect theAC power cord to the power board
and plug the AC power cord into the RV AC
receptacle.
9. Connect positive and the negative DC power wire
leads to the power board.
n
n
Positive wire (+) to terminal 12VDC.
Negative wire (–) to terminal 12_VGND1.
N61X/N81X Optical Control Assembly
N64XIM/N84XIM (ice maker)
• Reinstall the water valve and bracket assembly.
10. Turn ON the RV DC power to the refrigerator.
11. Plug theAC power cord into the refrigerator
receptacle.
12. Turn ON refrigerator, then check all power board
control functions before placing in service.
N62X/N82X Optical Control Assembly
Optical Control Assembly
The optical control assembly is attached to the
cabinet divider with two pan head Phillips screws.
Optical control assembly removal and installation
instructions, according to models, can be found in the
following pages:
n
n
n
Page 52, N611/N811 models.
Page 54, N62X/N82X models.
Page 57, N64X/N84X models.
N64X/N84X Optical Control Assembly
Figure 35. N6XX/N8XX Optical Control Assemblies
46
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Display board
Exposer le panneau
5
Divider heater
Chauffant de diviseur
1
1
5 Amp Fuse
5 Amp Fond
5 Amp Fuse
5 Amp Fond
Spark electrode
Declencher l’electrode
4
Temperature sensor / light assy.
Detector de temperature / allume assy.
- 12 VDC / VCC
+ 12 VDC / VCC
120 VAC
120 VCA
11
1
1
Gas valve
Gazer la soupape
Fan
Ventilateur
AC heater
CA chauffage
Fan thermostat
Ventilateur thermostat
N61X/N81X Wiring Pictorial.
12V GND1
Power board /
Panneau de
distribution
-12 VDC / -12 VCC
RED/
ROUGE
BLK/
NOIR
RED/
ROUGE
RED/
ROUGE
BLK/
NOIR
Gas solenoid valve /
Electrovanne a gaz
GV
K1
Fan / Ventilateur
Fan thermostat /
Ventilateur thermostat
12VDC
+12 VDC /+12 VCC
RED/ROUGE
BLK/NOIR
RED/ROUGE
3
11
Fan Models / Modeles Ventilateur
BLK/NOIR
RED/RGE
1
8
WHT/BLK/BLANC/NR
RED/WHT/RGE/BLANC
13
10
Light /
BLK/WHT/NR/BLANC
Lampe
F1
Temperature sensor / Thermosonde
Display board / Panneau de affichage
K4
WHT/RED/BLANC/RGE
Selector switch
Selecteur d’alimentation
2
Divider heater /
Chauffant de diviseur
Microprocessor
GAS
BLK/NOIR
3
1
12
14
9
BLU/BLEU
OFF
GRN/VERT
LED/DEL
WHT / VIO/BLANC/VIO
AUTO
16
5
2
AC HT HI1
AC HT LO1
L2
BLK/NOIR
LED/DEL
K2
BLK/NOIR
Temperature switch
Selecteur a la
4
temperature
F3
L1
120 VAC
120 VCA
AC heater /
CA chauffant
}
N61X/N81X Wiring Schematic.
Refrigerator Service Manual
N6XX/N8XX Models 47
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Models / Modeles
N62X, N62X.3,
Models / Modeles
N64X, N64X.3,
N84X, & N84X.3
N82X, & N82X.3
Display board overlay /
Exposer le panneau de planche
Display board / Exposer le panneau
Display board overlay /
Exposer le panneau de planche
Display board / Exposer le panneau
5
Divider heater / Chauffant de diviseur
3 Amp Fuse (.3 models)
3 Amp Fond (.3 modeles)
5 Amp Fuse
5 Amp Fond
Temperature sensor / light assy.
Detector de temperature / allume assy.
30 Amp Fus3
30 Amp Fond
Spark electrode
Declencher l’electrode
- 12 VDC / VCC
+ 12 VDC / VCC
120 VAC
120 VCA
Water line heater /
Arroser le chauffage de ligne
11
Thermostat
Gas valve / Gazer la soupape
Fan /
Ventilateur
AC heater
CA chauffage
Fan thermostat /
Ventilateur thermostat
DC heater (.3 models)
CC chauffage (.3 modeles)
N62X/N82X/N64X/N84X/N64X.3/N84X.3 Wiring Pictorial – Units with serial number
851759 and higher.
12V GND1
DC HT GND
GV GND
GV
Power board /
Panneau de
distribution
621829
-12 VDC / -12 VCC
RED/
ROUGE
BLK/
NOIR
RED/
ROUGE
RED/
ROUGE
YEL/JAUNE
BLK/
NOIR
Gas solenoid valve /
Electrovanne a gaz
DC heater /
CC chauffant
K1
Fan / Ventilateur
DC HEATER
K3
YEL/JAUNE
Fan thermostat /
Ventilateur thermostat
12VDC
+12 VDC /+12 VCC
RED/ROUGE
BLK/NOIR
RED/ROUGE
BLK/NOIR
3
11
Fan Models / Modeles Ventilateur
F2
RED/RGE
1
8
IM Models / Modeles IM
WHT/BLK/BLANC/NR
RED/WHT/RGE/BLANC
13
10
Light /
Lampe
BLK/WHT/NR/BLANC
Heater /
F1
Thermostat
Chauffant
Temperature sensor / Thermosonde
BRN/
BRUN
WHT/
BLANC
BRN/
BRUN
WHT/
BLANC
K4
WHT/RED/BLANC/RGE
2
Divider heater /
Chauffant de diviseur
ON-OFF
/ MODE / TEMP SET Switches
BLK/NOIR
11
ON-ARRETT / MODE / REGULATEUR TEMP. Commutateur
12
14
9
BLU/BLEU
Alarm / Alarme
12
GRN/VERT
WHT / VIO/BLANC/VIO
16
9
10
8
LEDs / DELs
AC HT HI1
BLK/NOIR
K2
AC HT LO1
BLK/NOIR
L2
Microprocessor /
Voltage regulator /
Regulateur de tension
Microprocesseur
Door switch /
Porte commutateur
F3
L1
120 VAC
120 VCA
AC heater /
CA chauffant
Display board /
Panneau de affichage
}
N62X/N82X/N64X/N84X/N64X.3/N84X.3 Wiring Schematic – Units with serial number
851759 and higher.
48
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1
3
2
5
5
5
4
5
1
9
5
8
1
14
4
10
6
16
9
11
18
7
17
1
COM
NO
13
15
19
12
N62X/N82X/N64X/N84X/N64X.3/N84X.3 Wiring Pictorial – Units with serial number lower
than 851759.
1
11
12
13
14
15
16
17
18
19
N62X/N82X Display overlay
12 Vdc connections
Gas valve
2
3
N64X/N84X Display overlay
N62X/N82X Display circuit board
N64X/N84X Display circuit board
Divider heater
AC heater
Fuse, 30 amp/auto blade type, 3-way models
DC heater, 3 way models only
Fuse, 3 amp for water line heater
Relay, water line heater
Water line heater
4
5
6
Lamp/Thermistor
7
AC power cord
8
Fuse, 5 amp/AGC type
Thermostat, water line heater
9
Fuse, 5 amp/standard auto type
Spark/sense electrode wire assembly
10
Refrigerator Service Manual
N6XX/N8XX Models 49
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2
12V GND1
DC HT GND
GV GND
GV
BRN/
BRUN
WHT/
BLANC
WHT/
BLANC
YEL/JAUNE
K1
20
21
3
19
8
DC HEATER
YEL/JAUNE
12VDC
BRN / BRUN
4
5
K3
RED/ROUGE
3
11
IM Models / Modeles IM
BLK/NOIR
RED/RGE
F2
1
8
WHT/BLK/BLANC/NR
RED/WHT/RGE/BLANC
BLK/WHT/NR/BLANC
WHT/RED/BLANC/RGE
6
10
11
13
10
2
11
F1
14
12
12
BLK/NOIR
BLU/BLEU
GRN/VERT
7
K4
16
9
14
10
15
9
12
13
1
9
8
WHT / VIO/BLANC/VIO
16
K2
AC HT HI1
BLK/NOIR
AC HT LO1
BLK/NOIR
L2
F3
L1
18
17
}
N62X/N82X/N64X/N84X/N64X.3/N84X.3 Wiring Schematic – Units with serial number
lower than 851759
1
11
12
13
14
15
16
17
18
Power board
TEMP SET switch
Door switch
2
3
–12 Vdc connection
Gas valve
Microprocessor
Alarm, N64X/N84X units only
7-segment LED N64X/N84X units
LED
4
+12 Vdc connection
Thermistor
5
6
Light, fresh food compartment
Divider heater
120 Vac connection
AC heater
7
8
On/OFF switch
19
20
21
DC heater, 3 way units only
Heater, ice maker water line
Thermostat, ice maker water line
9
Voltage regulator
Mode switch
10
50
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CONTROLS
ON LED
Mode Selector Switch
3-Position Slide Switch:
ꢀSlide left to select AUTO operation.
ꢀSlide right to select GAS operation.
ꢀGreen LED, indicates the refrigerator is ON.
ꢀAUTO operation, indicates AC power operation.
ꢀFlashes fault codes set by the controls.
GAS LED
Amber LED, indicates LP gas operation.
ꢀFlashes fault codes set by the controls.
Temperature Setting Selector Switch
5-Position Slide Switch:
ꢀSlide right to select a colder setting.
ꢀSetting range: 1=cold/9= coldest.
Figure 36. N61X/N81X Optical Control Assembly.
N61X/N81X Optical Control Assembly
The optical control assembly communicates with the
power board through a "foamed in" wire harness.
Drilling or puncturing the refrigerator rear panels may
cause damage to the wire harness. Controls and
related features are shown in Figure 36. The optical
control assembly with front box attached is shown in
Figure 37. The optical control assembly connected to
the wire harness is shown in Figure 38.
3. Reinstall the front box. Do not overtighten the
retaining screw.
4. Turn on the refrigerator, then check all of the
optical control assembly functions.
Front Box
Two tabs lock the front box to the optical control
assembly. A retaining screw on the hinge side retains
the front box to the divider. Shifting the refrigerator door
swing requires shifting the front box to the selected
hinge side.
Removal and Installation of Optical Control
Assembly.
To remove the optical control assembly:
Figure 37. N61X/81X Optical Control Assembly With
Front Box.
1. Turn off the refrigerator.
2. Remove the front box retaining screw, then remove
the front box.
3. Remove the optical control assembly retaining
screws.
4. Disconnect the optical control assembly from the
wire harness.
To install the optical control assembly:
1. Connect the optical control assembly to the wire
harness.
2. Install the optical control assembly on the divider.
Do not overtighten the retaining screws.
Figure 38. Wire Harness Connection.
Refrigerator Service Manual
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Modes of Operation
Backup Operating System
The Backup Operating System (BOS) allows cooling to
continue if the thermistor should fail. BOS is a duty
cycle operation. The duration of the cooling cycle can
be regulated by adjusting the temperature setting. The
higher the temperature setting number, the longer the
cooling cycle operates.
AUTO Mode
InAUTO mode, the controls automatically search forAC
power first. IfAC power is present, the controls
automatically selectAC operation. The selection ofAC
power is indicated by the ON LED.
No AC Power
When the controls switch operation to BOS, the ON
LED flashes once every three seconds. The flowchart
on page 20 provides thermistor troubleshooting
information.
If AC power is not present or is interrupted, the controls
automatically switch to LP gas operation. When the
controls switch to LP gas operation, the GAS LED
illuminates and a 30 second trial for ignition period starts.
Both ON LED and GAS LED will remain illuminated. The
ON LED indicates the refrigerator is turned ON. The GAS
LED indicates the controls selected LP gas because AC
power is not available.
“Gas Lock-Out”
"Gas lock-out" prevents the controls from
automatically attempting to reignite the burner after the
controls have detected an ignition failure. "Gas lock-
out" may be caused by any or a combination of the
following:
AC Power Restored
IfAC power is restored the controls automatically revert
operation toAUTOAC and the GAS LED turns off. The
ON LED will remain illuminated to indicateAUTOAC
operation.
n
n
No LP gas available (empty LP gas tank).
Incorrect LP gas pressure (LP gas pressure must
be 10.5 to 11.5 inches water column).
No AC and No Flame
n
n
n
n
Dirty burner.
If AC power is not present and a flame is not sensed after
the controls switch to LP gas, the flame sensing circuit
places the controls in "gas lock-out." In turn, the controls
command the ON LED and GAS LED to flash at one
second intervals.
Clogged, damaged, or the wrong orifice.
Incorrect electrode-to-burner air gap.
A damaged or grounded spark/sense electrode
assembly.
n
Damaged or inoperable gas valve.
The "A"/"no AC" flowchart on page 16 provides
information to troubleshoot noAC power faults.
To manually clear “Gas Lock-Out”:
n
n
n
Turn OFF the refrigerator.
Correct the no flame fault.
SelectAUTO or GAS operation.
The "F"/"no FL" flowchart on page 12 provides information
to troubleshoot no flame faults.
GAS Mode
In GAS mode, the controls will only select LP gas for
operation. GAS mode operation is monitored by the
flame sensing circuit. Normal GAS mode operation is
indicated by the GAS LED.
No Flame
In GAS mode, if a flame does not ignite during the 30
second trial for ignition, or the flame goes out, the
flame sensing circuit shuts off power to the gas valve
and places the controls in "gas lock-out." In turn, the
controls command the GAS LED to flash at one
second intervals.
The "F"/"no FL" flowchart on page 12 provides
information to troubleshoot no flame faults.
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TEMP SET Switch
Power Switch
ꢀPress momentarily to view temperature setting.
ꢀPress and hold to select desired temperature
setting.
ꢀPress momentarily to turn ON refrigerator.
ꢀPress and release after three seconds to turn
OFF refrigerator.
ꢀSettings: 1= cold/9= coldest.
LP GAS
COLDEST-9
TEMP
SET
AC
AUTO
ON
OFF
MODE
1-COLD
7-Segmet LED Display
Shows:
ꢀNormal operation on AUTO and LP GAS.
ꢀFault codes set by the control system.
ꢀTemperature setting.
MODE Switch
ꢀPress momentarily to display operating
mode.
ꢀPress and hold fo select AUTO, AC-Manual,
or LP Manual mode. Release when desired
mode displays.
ꢀDiagnostic information.
Figure 39. N62X/N82X Optical Control Assembly.
N62X/N82X Optical Control Assembly
The optical control assembly communicates with the
power board through a "foamed in" wire harness.
Drilling or puncturing the refrigerator rear panels may
cause damage to the wire harness. Controls and
related features are shown in Figure 39. The optical
control assembly with front box attached is shown in
Figure 40. The optical control assembly connected to
the wire harness is shown in Figure 41.
3. Reinstall the front box. Do not overtighten the
retaining screw.
4. Turn on the refrigerator, then check all of the
optical control assembly functions.
Front Box
Two tabs lock the front box to the optical control
assembly. A retaining screw on the hinge side retains
the front box to the divider. Shifting the refrigerator door
swing requires shifting the front box to the selected
hinge side.
Removal and Installation of Optical Control
Assembly
To remove the optical control assembly:
Figure 40. N611/811 Optical Control Assembly With
Front Box.
1. Turn OFF the refrigerator.
2. Remove the front box retaining screw, then remove
the front box.
3. Remove the optical control assembly retaining
screws.
4. Disconnect the optical control assembly from the
wire harness.
To install the optical control assembly:
1. Connect the optical control assembly to the wire
harness.
2. Install the optical control assembly on the divider.
Do not overtighten the retaining screw.
Figure 41. Wire Harness Connection.
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Modes of Operation
All N62X and N82X are designed for 2-way operation.
AUTO Mode
No AC Power and No Flame
When AC power is not present and a flame is not
sensed, the controls:
In AUTO mode, AC power is the first heat energy
source selected by the controls. If AC power is not
present, the controls shift to LP gas (propane), the
controls second priority heat energy source.
1. Aknowledge both faults after the 30 seconds trial-
for ignition is over.
AUTO AC Operation
When AUTO mode is selected:
2. Shut power to the solenoid gas valve.
3. Set "gas lock-out". See NOTE 2.
1. Mode of operation is indicated by the
AUTO LED.
AC
LP GAS
LP GAS
AUTO
4. Provide a visual warning by flashing alternatingA
(noAC) and F (no flame) fault codes, shown below.
See NOTE 3.
2. The AC LED comes on as the
controls search forAC power
availability.
AC
AUTO
3. TheAC LED turns off whenAC
power is selected by the controls.
Mode operation is indicated by the
AUTO LED. See NOTE 1.
AC
LP GAS
AC
LP GAS
AC
LP GAS
AUTO
AUTO
AUTO
Alternating "A" and "F" Codes
5. Record and store the noAC and no flame faults in
diagnostics nonvolatile memory fault history.
NOTE 1
In AUTO mode, pressing the MODE switchbutton
momentarily displays the heat energy source in use.
For example, in AUTO AC, the AC LED will come on
and stay on for approximately 10 seconds.
NOTE 2
In AUTO mode, the controls maintain "gas lock-out"
until a full cooling cycle on AUTO AC is completed.
Turning the refrigerator OFF and back ON also clears
"gas lock-out".
AUTO LP Gas Operation
In AUTO mode, the controls shift to LP gas when AC
power is not available or interrupted. The shift to AUTO
LP is as follows:
NOTE 3
1. The AUTO LED indicates the unit is
N62X/N82X models with serial number 854467 and
lower equipped with the original power board (p/n
619353) and optical control assembly (p/n 619350) will
only display fault indicator A.
AC
LP GAS
on and operating inAUTO mode.
AUTO
2. The AC LED comes on as the controls
verifyAC power availability.
AC
LP GAS
AUTO
Troubleshooting a "F"/"no" "FL" and "A"/"no" "AC"
Faults
Use the following references to identify, troubleshoot,
and correct an ignition failure and/or no AC faults.
3. Since AC power is not present, the
controls shift to LP gas. The LP LED
comes on to signal the start of a 30
seconds trial-for ignition.
AC
LP GAS
LP GAS
AUTO
n
n
n
Page 12, "F"/"no" "FL" fault codes troubleshooting
flowchart.
4. The controls sense the flame, turn off
the LP GAS LED leave the AUTO LED
on to indicateAUTO mode operation.
AC
Page 16, "A"/"no" "AC" fault codes troubleshooting
flowchart.
AUTO
Page 62, Diagnostic Mode–N62X/N82X Models,
Screen 4.
Shift from AUTO LP GAS to AUTO AC
In AUTO mode, the controls shift automatically from
AUTO LP GAS back to AUTO AC when the controls
detect that AC power has become available.
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LP Gas–Manual Mode
AC-Manual Mode
When the AC-Manual Mode is selected, AC power is
the only heat energy source selected by the controls.
When the AC-Manual Mode is selected:
When LP GAS-Manual Mode is selected, LP gas
(propane) is the only heat energy source selected by
the controls. When the LP GAS-Manual Mode is
selected:
1. Mode of operation is indicated by
the LP LED.
AC
LP GAS
1. Mode of operation selected is
indicated by the AC LED.
AC
LP GAS
AUTO
AUTO
2. The AC LED stays on as long as the AC–Manual
Mode is selected.
2. The LP GAS LED stays on as the LP GAS–
Manual Mode is selected.
Flame Fails to Ignite or Flame Goes Out
No AC Power or Loss of AC Power
If a flame does not ignite or the flame goes out, the
controls:
When no AC power or AC power is lost, the controls:
1. Set "gas lock-out" and shut off power to the
solenoid gas valve.
1. Provide a visual warning by flashing
the A (no AC) fault code.
AC
LP GAS
AUTO
2. Provide a visual warning by flashing
the F (no flame) fault code.
AC
LP GAS
2. Record and store the no AC fault in diagnostics
nonvolatile memory fault history.
AUTO
3. Record and store the no flame fault in diagnostics
nonvolatile memory fault history.
Troubleshooting a "A"/"no" "AC" Fault
Use the following references to identify, troubleshoot,
and correct a no AC fault.
Clearing "Gas Lock-Out"
n
Page 16, "A"/"no" "AC" fault codes troubleshooting
flowchart.
"Gas lock-out" can be cleared by turning the
refrigerator OFF and back ON.
n
Page 62, Diagnostic Mode–N62X/N82X Model,
Screen 4.
Troubleshooting a "F"/"no" "FL" Fault
Use the following references to identify, troubleshoot,
and correct an ignition failure fault.
AC Power Restored
When AC power is restored to the power board, the
controls:
n
Page 16, "F"/"no" "FL" fault codes troubleshooting
flowchart.
1. Automatically restoreAC–Manual Mode operation.
n
Page 62, Diagnostic Mode–N62X/N82X Mode,
Screen 4.
2. Clear the "A" fault code from the screen. However,
the recorded fault history will not be erased from
memory.
3. Display the AC LED.
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TEMP SET Switch
ꢀPress momentarily to view temperature setting. ꢀPress momentarily to turn ON refrigerator.
Power Switch
ꢀPress and hold to select a temperature setting.
ꢀSettings: 1= cold/9= coldest.
ꢀPress and release after three seconds to
turn OFF refrigerator.
1-COLD COLDEST-9
MODE
TEMP
SET
ON-OFF
ON
Two, 7-Segmet LED Display
Show:
ꢀOperation mode AUTO, AC, LP and DC
(3-way models only).
ꢀFault codes and diagnostic information.
ꢀTemperature setting.
MODE Switch
ꢀPress momentarily to display operating mode.
ꢀPress and hold to select AUTO, AC or LP Manual
Mode, or DC Manual Mode (3-way models only).
Release when desired mode displays.
Figure 42. N64X/N84X Optical Control Assembly.
N64X/N84X Optical Control Assembly
The optical control assembly communicates with the
power board through a "foamed in" wire harness.
Drilling or puncturing the refrigerator rear panels may
cause damage to the wire harness. Controls and
related features are shown in Figure 42. The optical
control assembly with front box attached is shown in
Figure 43. The optical control assembly connected to
the wire harness is shown in Figure 44.
3. Reinstall the front box. Do not overtighten the
retaining screw.
4. Turn on the refrigerator, then check all of the
optical control assembly functions.
Front Box
Two tabs lock the front box to the optical control
assembly. A retaining screw on the hinge side retains
the front box to the divider. Shifting the refrigerator door
swing requires shifting the front box to the selected
hinge side.
Removal and Installation of Optical Control
Assembly
To remove the optical control assembly:
Figure 43. N64X/84X Optical Control Assembly With
Front Box.
1. Turn off the refrigerator.
2. Remove the front box retaining screw, then remove
the front box.
3. Remove the optical control assembly retaining
screws.
4. Disconnect the optical control assembly from the
wire harness.
To install the optical control assembly.
1. Connect the optical control assembly to the wire
harness.
2. Install the optical control assembly on the divider.
Do not overtighten the retaining screw.
Figure 44. Wire Harness Connection.
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Modes of Operation
Shift from AUTO LP GAS to AUTO AC
AUTO
In AUTO mode, the controls shift automatically from
AUTO LP GAS to AUTO AC any time the controls
sense that AC power is available.
In AUTO mode, AC power is the first heat energy
source selected by the controls. If AC power is not
present, the controls shift to LP gas (propane), the
second priority heat energy source.
No AC Power and No Flame
AUTO – N64X.3/N84X.3 (3-way units)
When AC power is not present and a flame is not
sensed, at the end of the 30 seconds trial-for ignition,
the controls:
In 3-way units, if LP gas if a flame is not sensed, then
flame goes out, or an ignition failure occurs, the
controls shift to DC power, the third priority heat
energy source. For additional information on 3-way
units AUTO mode, see page 58.
1. Shut off power to the solenoid gas valve.
2. Set "gas lock-out". See NOTE 2.
AUTO AC Operation
When the AUTO mode is selected, the controls:
3. Sound the alarm (an intermittent beeping tone).
1. DisplayAUTO ("AU") mode operation
4. Provide a visual warning by flashing alternating
"no" "AC" and "no" "FL" (no flame) fault codes
shown below).
indicator.
A
A
2. Flashes "AU" and "AC" as the
o
n
search forAC power begins.
3. Turn off "AU" and "AC" whenAC power is
selected and displays the ON LED. See
NOTE 1.
5. Record and store the "no" "AC" and "no" "FL"
faults in diagnostics nonvolatile memory fault
history.
NOTE 1
NOTE 2
In AUTO mode, pressing the MODE switchbutton
momentarily displays the heat energy source in use.
For example, inAUTOAC, the display alternate flashing
AU and AC for approximately 10 seconds.
AUTO LP mode remains in "gas lock-out" until a full
cooling cycle on AUTO AC is completed. "Gas lock-
out" can also be cleared by turning the refrigerator OFF
then back ON.
AUTO LP Operation
Shift from AUTO LP GAS to AUTO AC
The controls shift to AUTO LP mode any time AC
power is not available. The controls shift to AUTO LP
as follows:
In AUTO mode, the controls shift automatically from
AUTO LP GAS back to AUTO AC when the controls
detect that AC power has become available.
1. TheAUTO mode operation indicator
Troubleshooting No Flame and No AC Faults
Use the following references to identify, troubleshoot,
and correct an ignition failure and/or no AC faults.
("AU") displays.
A
2. "AU" and "AC" indicator
o
n
n
n
Page 12, "F"/"no" "FL" fault codes
troubleshooting flowchart.
alternate flashing on the display
while the controls search forAC
power.
n
Page 16, "A"/"no" "AC" fault codes
troubleshooting flowchart.
3. When AC power is not present, the
controls shift to AUTO LP mode. "AU"
and "LP" alternate flashing on the
Page 62, Diagnostic Mode–N62X/N82X Models,
Screen 4.
o
n
display as the controls start a 30
seconds trial-for ignition.
4. The controls sense the flame, turn off the
"AU" and "LP", and display the ON LED.
See NOTE 1.
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AC-Manual Mode
AUTO DC Operation – 3-Way Units Only
In AUTO DC mode, the controls shift to DC power
when AC power is not present and flame is not
sensed. The shift to AUTO DC operation does not
show on the display. The shift is invisibly performed by
the controls. When the controls shift to AUTO DC:
In the AC-Manual Mode, AC power is the only heat
energy source selected by the controls. When the
controls shift to AC-Manual Mode:
1. The AC mode indicator ("AC")displays as
the controls start the search for AC
power.
1. TheAUTO ("AU") mode operation
indicator displays.
2. When AC power is selected, the AC
indicator turns off. The ON LED displays.
See NOTE 3.
2. "AU" and "AC" indicators
alternate flashing on the display
o
n
as the controls search for AC
power.
NOTE 3
Pressing the MODE switchbutton displays the "AC"
mode indicator.
3. When AC power is not present the
controls shift to AUTO LP mode.
A
"AU" and "LP" indicators alternate
o
n
flashing on the display as the
controls start a 30 seconds trial-for
ignition.
No AC Power or Loss of AC Power
If the controls do not sense the presence of AC power
or when AC power is lost, the controls:
4
Not sensing a flame causes the controls to shift to
Auto DC power. The shift to DC power is not
displayed. See NOTE 1.
1. Display the "no" "AC" fault code.
A
5. The ON LED displays. See NOTE 2.
2. Sound the audible alarm. The alarm is an
intermittent beeping tone. Pressing the mode
switchbutton silences the alarm.
NOTE 1
Pressing the MODE switchbutton will displays the "AU"
and "dc" indicators.
3. Record and store the "no" "AC" fault in diagnostics
nonvolatile memory fault history.
AC Power Restored
When AC power is restored, the controls:
NOTE 2
1. Automatically restoreAC-Manual Mode operation;
however, the recorded fault history will not be
erased from memory.
The auto sequence described in steps 1 through 5 is
repeated after the completion of each cooling cycle to
enable the controls to select a higher priority heat
energy source if available.
2. Silence the alarm and clear then "no" "AC" fault
The control's priorities for selecting a heat energy source
are:
code from the display.
n
n
n
First priority:
AC power.
Troubleshooting "no" "AC" Fault
Use the following references to identify, troubleshoot,
and correct a no AC fault.
Second priority: LP gas.
Third priority:
DC power – 3-way units only.
n
Page 16, "A"/"no" "AC" fault codes
troubleshooting flowchart.
n
Page 62, Diagnostic Mode – N62X/N82X Model,
Screen 4.
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LP-Manual Mode
DC-Manual Mode
In the LP-Manual Mode, LP gas is the only heat
energy source selected by the controls. When the
controls shift to LP-Manual mode:
The DC-Manual Mode is the only heat energy source
aknowledged and selected by the controls. When the
controls shift to DC-Manual mode:
1. The LP mode indicator ("LP") displays
and the controls start a 30 seconds
trial-for-ignition.
1. DC mode indicator ("dc") displays as
the controls start the seach for DC
power.
2. The dc mode indicator turns off when the
controls shift to DC power. The ON LED
displays. See NOTE below.
2. The LP mode indicator turns off when the
controls sense a flame. The ON LED
displays. See NOTE below.
NOTE 4
NOTE 6
Pressing the MODE switchbutton displays the "LP"
Pressing the MODE switchbutton displays the "dc"
mode indicator.
mode indicator.
No DC Power to DC Heater Circuit
If the controls do not sense that DC power is available
to the DC heater circuit, the controls:
Flame Fails to Ignite or Flame Goes Out
If the controls do not sense a flame within the 30
seconds trial-for-ignition, the controls:
1. Display the "dc" "HE" fault code.
1. Shut-off power to the solenoid gas valve.
o
n
2. Set "gas lock-out." See NOTE 5 below.
3. Display a flashing visual warning, "no" "FL"
2. Sound the audible alarm. The alarm is an
intermittent beeping tone. Pressing the mode
switchbutton silences the alarm.
(shown below).
4. Sound an audible alarm. The alarm is an
intermittent beeping tone. Pressing the mode
switchbutton silences the alarm.
NOTE 5
AUTO LP mode remains in "gas lock-out" until a full
cooling cycle on AUTO AC is completed. "Gas lock-
out" can also be cleared by turning the refrigerator OFF
then back ON.
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DIAGNOSTIC MODE — MODELS N62X/N82X
Display
LP GAS
AC
TEMP
SET
ON
OFF
MODE
AUTO
COLDEST-9
1-COLD
Figure 45. N62X0/N82X Optical Control Assembly.
Diagnostic Mode
The Diagnostic Mode uses nine diagnostic channels,
commonly known as "screens", to display "live"
inputs, outputs, and fault history. Each screen is
identified by a number, which shows in the optical
control assembly display. See Figure 45.
Accessing the Diagnostic Mode
To access the Diagnostic Mode:
TEMP
SET
MODE
1. Press and hold both the
and
buttons at the same time.
TEMP
SET
MODE
2. Release the
and
as soon as
The N62X/N82X optical control display uses a single 7-
segment LED module to display diagnostic
screen displays.
information. Information made up of two letter or
numbers display in an alternating sequence. Fault
history information, "live" inputs, and outputs, are
presented using lighted LED segments. The
diagnostic LED segments, if present, displays after
the screen number turns off. Diagnostic LED
segments identification numbers. See Figure 46.
3. A few seconds later,
displays.
Changing Screens
MODE
To change screens, Press
the button until the
next screen displays.
Exiting the Diagnostic Mode
To exit the Diagnostic Mode:
.
TEMP
SET
MODE
1
1. Press and hold the
and
buttons at
the same time.
2
3
TEMP
SET
MODE
4
2. Release the
and
buttons as soon as
the LED segment that represents the selected
operation mode appears on the display (AUTO,
AC, or LP GAS).
5
6
7
Turning the refrigerator OFF then back ON also exits
the Diagnostic Mode
Figure 46. Diagnostic LEDs Segments Identification.
60
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Screens and Diagnostic Segments Information
Screen
Diagnostic Mode Active
Screen
Thermistor Fin Temperature
Screen 1 confirms that the Diagnostic Mode is active. A
few seconds after the number displays, all LED
segments light. See illustration
Screen 3 shows the actual fin temperature being
sensed by the thermistor. This is not the fresh food
cabinet air temperature. The illustration shows 30°F fin
temperature as displayed in screen 3.
2 Seconds
1 Second
= 30°F
If the LED segments do not match the illustration, the
fault is in the optical control display.
Screen
Number
Blank
Screen
(2 second
pause)
Replacing the optical control assembly should resolve
this fault.
MODE
MODE
Press the
button to bring up screen 2.
Press the
button to bring up screen 4.
Screen
LED Segments Reliability Check
Screen
Stored Fault History
Screen 2 continues to confirm the reliability of the
display. The screen should go completely blank after
the screen number is displayed.
Screen 4 displays stored fault history using lighted LED
segments. The illustration provides fault history
information and assigned LED segments. If a fault
occurred, its assigned LED will light.
Ignition fault
1
DC voltage low
2
3
Door ajar
4
DC voltage high
AC mode selected
but not available
5
6
AC relay stuck closed
7
AC heater failed open
MODE
Press the
button to bring up screen 5.
If an LED segment displays, the fault is in the optical
control assembly.
Replacing the optical control assembly should resolve
this fault.
Screen
Stored Fault History
Screen 5 also displays stored fault history using lighted
LED segments. The illustration provides fault history
information and assigned LED segments. If a fault
occurred, its assigned LED will light.
MODE
Press the
button to bring up screen 3.
Thermistor failure.
1
2
3
Flame sense failure
4
5
6
AC voltage low
AC voltage high
MODE
Press the
button to bring up screen 6.
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Screen
Erase Fault History Data
Screen
Power Board Outputs
Screen 6 provides a way to erase stored fault history
from memory. To erase stored fault history:
Screen 8 display "live" power board outputs using
lighted LED segments. The illustration below provides
"live" outputs information and assigned LED segments.
If the power board output is active or "live," the
assigned LED will light.
TEMP
1. Press and hold the
button when
and
SET
display.
AC power to AC heater
1
TEMP
SET
3
DC power to divider heater
2. Release the
button when
and
4
DC power to gas valve
5
6
DC power to
light switch
display.
DC power to ignition circuit
3. Wait five seconds.
4. Press and hold the
display again.
TEMP
SET
MODE
button until
and
Press the
button to bring up screen 9.
MODE
Press the
button to bring up screen 7.
Screen
Power Board Inputs
Screen
Power Board DC Voltage Status
Screen 7 displays "live" power board inputs using
lighted LED segments. The illustration below provides
Screen 9 display power board DC voltage status using
lighted LED segments. The illustration below provides
"live" inputs information and assigned LED segments. If a DC voltage status and assigned LED segments. If DC
power board input is active or "live", its assigned
voltage at the power board within normal range (10.5
LED will light.
to 15.4 Vdc), LED segment 4 will be on.
DC voltage higher than 15.4 volts
Food compartment light
is off and door is closed
1
1
Thermistor sensing
fin temperature
2
3
Sensing burner flame
4
DC voltage normal
7
DC voltage lower than 10.5 volts
MODE
MODE
Press the
button to return to screen 1.
Press the
button to bring up screen 8.
62
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DIAGNOSTIC MODE — MODELS N64X/N84X
Display
1-COLD COLDEST-9
MODE
TEMP
SET
ON-OFF
ON
Figure 47. Models N64X/N84X Optical Control Assembly.
Diagnostic Mode
The Diagnostic Mode uses ten diagnostic channels,
commonly known as "screens", to display "live"
inputs, outputs, and fault history. Each screen is
identified by a number, which shows in the optical
control assembly display. See Figure 47.
Accessing the Diagnostic Mode
To access the Diagnostic Mode:
1. Press and hold both the
and
buttons at
TEMP
SET
MODE
the same time.
The N64X/N84X optical control display uses a dual 7-
segment LED module to display the screen number
and diagnostic information. Information made up of four
letters or digits displays in an alternating sequence.
Fault history, "live" inputs, and outputs is presented
using LED segments. The diagnostic LED segments, if
present, display to the right of the screen number.
Diagnostic LED segments identification numbers. See
Figure 48.
2. Release the
and
as soon as screen
displays.
TEMP
SET
MODE
displays.
3. A few seconds later,
Changing Screens
To change screens, press and hold the
button
MODE
until the next screen displays.
Exiting the Diagnostic Mode
To exit the Diagnostic Mode:
1
2
3
1. Press and hold
and
buttons at the
TEMP
SET
MODE
same time.
4
5
6
2. Release the
and
buttons as soon as the
TEMP
SET
MODE
ON Light
7
display shows
.
Turning the refrigerator OFF then back ON also exits
the Diagnostic Mode.
Figure 48. Diagnostic LEDs Segments Identification.
Refrigerator Service Manual
N6XX/N8XX Models 63
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Screens and Diagnostic Segments Information
Screen
Diagnostic Mode Active
Screen
Stored Fault History
Screen 1 confirms that the Diagnostic Mode is active. A
few seconds after the screen number appears, all LED
segments light. See illustration.
Screen 4 displays stored fault history using lighted LED
segments. The illustration provides fault history
information and assigned LED segments . If a fault
occurred, its assigned fault history LED will be on.
ajar
Door
fault
Ignition
1
ow
ltage l
DC vo
3
2
Screen
Number
4
high
ltage
DC vo
If the screen segments do not match the ones shown in
the illustration, the fault is in the optical control
assembly. Replacing the optical control should resolve
the fault.
6
5
closed
lay stuck
AC re
7
open
failed
AC heater
selected
le
availab
AC mode
* 3-way models
but not
Press the
button to bring up screen 2.
Press the
button to bring up screen 5.
MODE
MODE
Screen
Stored Fault History
Screen
LED Segments Reliability Check
Screen 5 also displays stored fault history using lighted
LED segments. The illustration provides fault history
information and assigned LED segments . If a fault
occurred, its assigned fault history LED will be on.
Screen 2 diagnostics continue to confirm the reliability of
the display. After a few seconds only the ON light
displays. All other LED segments should be off. See
illustration.
Flame sense failure
Thermistor failure.
1
2
3
DC relay stuck closed*
Screen
Number
4
DC heater failed open*
ON Light
5
6
AC voltage high
The ON light should be the only LED displayed. If any
other LED displays, the fault is in the optical control
assembly. Replacing the optical control should resolve
the fault.
* 3-way models
AC voltage low
Press the
button to bring up screen 6.
MODE
Press the
button to bring up screen 3.
MODE
Screen
Erase Fault History
Screen 6 provides a way to erase fault history from
memory. To erase fault history:
Screen
Thermistor Fin Temperature
Screen 3 displays the actual fin temperature being
sensed by the thermistor. This is not the fresh food
cabinet air temperature. The illustration shows 32°F fin
temperature as displayed in screen 3.
1. Press and hold the
on the screen.
button when
shows
TEMP
SET
2. Release the
screen.
button when
shows on the
TEMP
SET
= 32°F
3. Wait five seconds.
4. Press and hold the button until
screen.
show on the
Press the
button to bring up screen 4.
MODE
Press the
button to bring up screen 7.
MODE
64
N6XX/N8XX Models
Refrigerator Service Manual
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Screen
Power Board Inputs
Screen
Power Board DC Voltage Status
Screen 7 displays "live" power board inputs using
lighted LED segments. The illustration below provides
Screen 9 displays DC voltage status using lighted LED
segments. The illustration below provides DC voltage
"live" inputs information and assigned LED segments. If a status information and assigned LED segments. If DC
power board input is active or "live," its assigned
input LED will be on.
voltage at the power board within normal range (10.5
to 15.4 Vdc), LED segment 4 will be on.
Food comparment light
is off and door is closed
DC voltage higher than 15.4 volts
Sensing burner flame
1
1
Thermistor sensing
fin temperature
2
3
Screen
Number
Screen
Number
4
DC voltage normal
7
DC voltage lower than 10.5 volts
Press the
button to bring up screen 8.
Press the
button to bring up screen 0.
MODE
MODE
Screen
Power Board Outputs
Screen
Power Board AC Voltage Status
Screen 8 displays "live" power board outputs using
lighted LED segments. The illustration below provides
"live" outputs information and assigned LED segments.
If a power board output is active or "live," its
assigned output LED will be on.
Screen 0 displays AC voltage status using lighted LED
segments. The illustration below provides AC voltage
status information and assigned LED segments. If AC
voltage at the power board within normal range (108
to 132 Vac), LED segment 4 will be on.
DC power to DC heater*
AC voltage higher than 132 volts
AC power to AC heater
1
1
2
3
DC power to divider heater
DC power to gas valve
Screen
Number
Screen
Number
4
4
AC voltage normal
5
6
DC power to ignition circuit
7
AC voltage lower than 108 volts
DC power to light switch
*3-way models
Press the
button to bring up screen 9.
Press the
button to return to screen 1.
MODE
MODE
Refrigerator Service Manual
N6XX/N8XX Models 65
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ICE MAKER
The ice maker is a factory installed accessory. The
components that support the ice maker are the water
valve, water fill line, water fill tube, and the wire
harness. The ice maker and components are shown in
Figure 49.
Water Valve
Figure 49(b) shows an ice maker solenoid water valve
that has a 12 Vdc water line heater. The 12 Vdc heater
is controlled by a thermostatic switch mounted on the
valve's mounting bracket.
Figure 49(c) shows an ice maker solenoid water valve
without a 12 Vdc water line heater.
Wire Harness
The wire harness, Figure 49(a) has four wires.
n Black–line (L) voltage with thermal fuse for ice
mold overheating protection. It has an insulated female
quick-connect terminal.
Specifications
Cycle ....................... One revolution (eject and water fill)
Water fill capacity ............................ 4.7 fl. oz. (140 mL)
Ice yield ............................ 3.5 lbs/24 hrs. (approximate)
n White–neutral (N). The insulated male quick-
connect terminal is the 120 Vac neutral (N) conductor . Cycle duration...................................... 3.5 to 7 minutes
Voltage............................................................... 120Vac
n Brown–supplies 120 Vac power to the water valve
Amp draw
solenoid during the fill cycle. It connects to water valve
solenoid M terminal.
Cycle on/heater on ............................................... 1.6 A
Cycle on/heater off ............................................... 0.3 A
Cycle off .................................................. No amp draw
Motor ....................................................... 1.5 W/8800 Ω
Mold Heater ................................................ 185 W/72 Ω
n Green–ground. Connects to the metal cabinet
metal plate along with the 120 Vac power cord ground
wire.
Fill Tube
The fill tube is foamed into the top of the cabinet. It is
not a replaceable component.
Fill Tube
(a)
Cover
Shut-Off Arm
Ice Maker
Black = L
White = N
Brown= V
Green= Ground
Ice Bin
Connector
Thermal Fuse
Wire Harness
(b)
(c)
120 Vac Terminals
Heater
Wire Leads
Foil Type
Water Line
Heater
Water Valve Assembly
with water line heater
Water Valve Assembly
without water line heater
Figure 49. Ice Maker.
66
N6XX/N8XX Models
Refrigerator Service Manual
Errata Sheet, 01/16/04
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Ice Maker Troubleshooting Chart
Problem
Probable Cause
Remedy
n
No ice in mold/no ice
A. No AC power to ice maker
A. Check AC power supply.
yield.
B. No water available to ice
maker.
B. Check water supply to ice maker water.
C. Clean water valve inlet strainer.
D. Test water valve operation (see page 69).
C. Water valve strainer clogged.
D. Water valve failure.
n
Ice in mold/no ice yield.
A. No AC power available.
A. Check AC power supply.
B. Shut-off arm in the OFF
position.
B. Lower the shut-off arm to the ON
position.
C. Mold over filled.
C. Check position of water valve orifice.
D. Replace water valve.
D. Water valve washer seal
damaged.
n Mold dripping water/
A. Water fill adjustment screw
set incorrectly.
A. Reset the water adjustment screw.
B. Replace water valve
overflowing.
B. Water valve washer seal
damaged.
n
Ice maker will not cycle,
AC power available.
A. Mold heater failed open.
B. Motor failure.
A. See page 68.
B. See pages 68 and 69.
C. See page 68.
C. Mold thermostat failure.
D. Wire harness thermal fuse
open.
D. See page 69.
Replacing the Ice maker
To remove the existing ice maker (see Figure 50):
11. Tighten all screws firmly.
12. Plug the AC cord in the RV AC power receptacle.
1. Unplug the refrigerator or ice makerAC power cord
from the RVAC power receptacle.
2. Remove the freezer bolts along with the flat
washers (two, 1 inch long screws).
Cover
3. Remove two upper mounting screws (two, 1/2 inch
screws).
4. Unplug the wire harness from the ice maker.
Mounting Screws
5. Remove two mounting plate screws (two Phillips
head screws), then remove the mounting plate.
6. Remove the shut-off arm and install it in the new
ice maker.
7. Attach the mounting plate to the bottom of the new
ice maker (two Phillips head screws). Tighten
screws firmly.
8. Plug the wire harness into the ice maker. Make
sure the plug locking tab locks the plug in the
connector.
Bottom
Mounting Screws
(2 each)
Freezer Plate Screws (2)
(1 in. long with washer)
9. Attach the mounting plate to the freezer plate (two,
1 inch long screws with washers)
10. Attach the upper mounting brackets to the freezer
plate (two, 1/2 inch screws).
Figure 50. Ice Maker Mounting Hardware.
Refrigerator Service Manual
N6XX/N8XX Models 67
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Cycle Test
DISCONNECT POWER
TO REMOVE MODULE
Cycle testing the ice maker will confirm if the mold
heater energizes and motor complete a full cycle.
However, if the ejector fingers are trapped in the ice
allow the ice to partially thaw before cycle testing the
ice maker.
R U 185W-115V-60 HZ
106 626649
11 MAY 00
IM #
S
N
M
T
To cycle test the ice maker:
V
T
H
1. Shut off the water supply to the ice maker water valve.
2. Remove the ice maker cover.
L
Shut-Off Arm
(ON position)
3. Place the shut-off arm in the ON position (down).
4. Make sure 120 VAC is available to the ice maker.
RMS MULTIMETER
87III TRUE
V
MIN MAX
RANGE
HOLD
H
REL
Hz
4
1/2 DIGITS PEAK MIN MAX
1
Seconds
mV
5. Measure voltage across test points L and N. See Figure
51. Voltage reading should be between 108 to 120 Vac. If
no voltage present, check the continuity of the ice maker
wire harness.
mA
V
V
A
µA
V
108 to 120 Vac
OFF
A
mA µA
COM
V
!
400mA M
FUSED
A
T
I
I
10A MAX
FUSED
0V MAX
!
Figure 51. Test points L and N.
NOTE
Shorting test points T and H will start the cycle. Remove
the jumper wire from test points T and H when a click
sound is heard or immediately after 15 seconds of
shorting terminals T and H.
DISCONNECT POWER
TO REMOVE MODULE
R U 185W-115V-60 HZ
106 626649
11 MAY 00
IM #
S
N
M
T
!
WARNING:
V
Burn hazard! The mold heater will heat the bottom
of the mold. Handle or grasp the ice maker by its
sides when performing a cycle test.
T
H
L
Shut-Off Arm
(ON position)
Insulated Jumper Wire
(14 AWG with 1/2" stripped ends)
6. Short terminals T and H.An insulated jumper wire 14
AWG with 1/2 inch stripped ends is recommended. See
Figure 52. The following events should take place during
the cycle:
Figure 52. Test points T and H.
a. The mold heater begins to heat the mold.
b. The ice maker ejector starts to cycle.
c. About 15 seconds into the cycle, the thermostat
produces a “click” sound.
DISCONNECT POWER
TO REMOVE MODULE
R U 185W-115V-60 HZ
IM # S 106 626649
11 MAY 00
N
NOTE
M
T
E
Water fill adjustment
alignment indicator
A
T
M
A
O
R
N
Remove the jumper wire immediately after hearing the
"click" sound or 15 seconds after shorting terminals T
and H. Failing remove to the jumper wire will cause
damage to the heater and/or overheat the mold, which
will ruin the ice maker.
U
T
A
O
L
N
L
Y
O
D
Water fill
adjustment
screw
V
T
H
L
d. As the ejector fingers reach the 12 o'clock position
the water valve energizes.
Figure 53. Water Fill Adjustment Screw and
Indicator.
6. If the water valve does not remain energized between 3.5
and 7.5 seconds, see Water Fill Adjustment, page 70.
68
N6XX/N8XX Models
Refrigerator Service Manual
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Water Fill Adjustment
The ice maker water fill adjustment is factory set.
Tampering with the water adjustment screw may cause
the water valve to close before the mold is filled to
normal level or exceed the mold water level. If the valve
closes before the mold is filled to capacity, the ice
cubes produced will be small and thin. If the water
valve remains open longer than 7.5 seconds, the water
level in the mold will be above the normal level. The
excess water above the normal level tends to form a
layer of ice that fuses all the ice cubes. The surface
tension created by the extra layer of ice prevents the
ejector from removing the ice cubes from the mold.
DISCONNECT POWER
TO REMOVE MODULE
R U 185W-115V-60 HZ
IM # S 106 626649
11 MAY 00
N
M
T
V
T
H
L
The water fill adjustment screw location is shown in
Figure 53, page 69. Turning the screw 1/4 turn in a
clockwise or counterclockwise direction varies the fill
by 0.34 fl. oz. (10 mL).
Insulated jumper wire
(14 AWG with 1/2-stripped ends)
Turning the screw varies the location of the adjustable
internal copper contact. The small hole in the contact
should be in the center of the module housing hole
(alignment indicator). With the hole centered, the
water valve should remain open approximately 7.5
seconds.
Figure 54. Energizing water valve through test
points V and L.
Low Ice Yield
The thermostat initiates the cycle when the
temperature of the mold is approximately 14°F. For the
ice maker mold to reach 14°F, the freezer temperature
must be maintained at or below 0°F. In gas absorption
refrigerators low ice yield may be caused by poor
cooling unit ventilation, which will directly affects
freezer temperature.
Water Valve Operation Test
DISCONNECT POWER
Test water valve operation by shorting points V and L
using an insulated jumper wire. See Figure 54.
Shorting points V and L energizes the valve's solenoid.
When energized, the solenoid will make an audible
click and continuous buzzing sound until the jumper
wire is removed.
TO REMOVE MODULE
R U 185W-115V-60 HZ
106 626649
11 MAY 00
IM #
S
N
M
T
V
Water Valve Solenoid Resistance
Always disconnect the ice maker AC power cord
before taking resistance readings on the water valve
solenoid.
T
H
L
Shut-Off Arm
(ON position)
RMS MULTIMETER
87III TRUE
To contact test points V and N, the resistance meter's
probes must be at least 1/2 inch long. See Figure 55.
MIN MAX
RANGE
HOLD
H
REL
Hz
4
1/2 DIGITS PEAK MIN MAX
1
Seconds
mV
mA
A
V
V
µA
OFF
295 to 360 ohms
A
mA µA
COM
V
n
n
Resistance values: 295 to 360 Ω.
OL: check for loose wire harness connections at
the water valve or an open solenoid coil.
!
400mA MAX
FUSED
C
A
T
I
I
10A MAX
FUSED
0V MAX
!
n
00.0 Ω: indicates a short between the ice maker
and the water valve.
Figure 55. Measuring water valve solenoid
resistance across points V and N.
Refrigerator Service Manual
N6XX/N8XX Models 69
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Mold Heater Resistance Check
Unplug the ice maker AC power cord before taking any
DISCONNECT POWER
TO REMOVE MODULE
R U 185W-115V-60 HZ
106 626649
11 MAY 00
IM #
S
N
resistance readings on the ice maker.
M
T
To contact test points L and H, the test probes must
be at least 1/2 inch long. Connect the multimeter's
probes as shown in Figure 56.
n
n
Resistance values: 71 to 79 Ω.
Replace the ice maker if the mold heater
resistance is not within 71 and 79 Ω.
V
T
H
L
Shut-Off Arm
(ON position)
Checking Voltage at Motor Terminals
Make sure AC power is available to the ice maker
before taking voltage readings across test points N
and M.
RMS MULTIMETER
87III TRUE
MIN MAX
RANGE
HOLD
H
REL
Hz
4
1/2 DIGITS PEAK MIN MAX
1
Seconds
mV
mA
A
V
V
µA
OFF
A
mA µA
COM
V
!
400mA MA
FUSED
A
T
I
I
10A MAX
FUSED
00V MAX
!
To contact test points N and M, the test probes must
be at least 1/2 inch long. Figure 57 shows the
multimeter connections to points N and M to measure
voltage. The voltage across points L and M should be
108 to 132 Vac. If no voltage is detected, make sure
replace the ice maker.
Figure 56. Measuring mold heater
resistance across test points L
and H.
Winterizing the Ice Maker Water
To winterize the ice maker:
DISCONNECT POWER
TO REMOVE MODULE
R U 185W-115V-60 HZ
106 626649
11 MAY 00
IM #
S
N
1. Shut off the RV water supply to the ice maker.
M
T
2. Lower the ice maker shut-off arm to the off position.
3. Disconnect the garden hose adapter from the water
valve.
V
4. Disconnect the ice maker water supply line from the
water valve. Do not unwrap the water line heater wire
from the water valve outlet connection.
T
H
L
Shut-Off Arm
(ON position)
.
5. Allow the water to drain from the RV water supply line
and the ice maker water line.
RMS MULTIMETER
87III TRUE
V
MIN MAX
RANGE
HOLD
H
6. Protect connections by bagging and taping RV water
supply connection, the ice maker water line connection,
and the water valve connections
REL
Hz
4
1/2 DIGITS PEAK MIN MAX
1
Seconds
mV
mA
V
V
A
µA
V
OFF
A
mA µA
COM
V
!
400mA MA
FUSED
C
A
T
I
I
10A MAX
FUSED
00V MAX
!
Figure 57. Checking voltage to motor across test
points N and M.
70
N6XX/N8XX Models
Refrigerator Service Manual
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Ice Maker
Thermal
Fuse
Green
Solenoid
Water Valve
Brown
Green
White
Black (ribbed)
White
Black
Black (smooth)
AC Power Cord
Power Board
N64X IM/N84XIM – Wiring Pictorial for Ice Maker Wired to Refrigerator AC Cord.
Switch
(Shut-off arm)
L
H
N
OFF
Mold Heater
NO
Thermostat
Thermal Fuse
Black
White
NC
Green
Ground
T
Solenoid
(water valve)
Fill switch
NO
NC
Brown
Motor
NC
Motor switch
NO
V
M
N64X IM/N84XIM – Wiring Schematic for Ice Maker Wired to Refrigerator AC Cord.
Refrigerator Service Manual
N6XX/N8XX Models 71
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Ice Maker
Thermal
Fuse
Ground
Connection
GRN / VERT
Solenoid
Water Valve
BRN BRUN
NEUTRAL (RIBBED) /
NEUTRE (À NERVURES)
N
G
L
HOT(SMOOTH)/
AC Power Cord
CHAUD (PLAT)
N64X IM/N84XIM – Wiring Pictorial for Ice Maker Wired to White AC Power Cord
Switch
(Shut-off arm)
L
H
N
OFF
Mold Heater
NO
Thermostat
Thermal Fuse
Black
White
NC
Green
Ground
T
Solenoid
(water valve)
Fill switch
NO
NC
Brown
Motor
NC
Motor switch
NO
V
M
N64X IM/N84XIM – Wiring Schematic for Ice Maker Wired to White AC Power Cord
72
N6XX/N8XX Models
Refrigerator Service Manual
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Publication No. 619394E (0-28-04)
N61X/N81X
N62X/N82X
N64X/N84X/N64X.3/N84X.3
NORCOLD CUSTOMER SERVICE
Telephone ............................... 1-800-444-7210
Fax ............................................... 937-497-3183
World Wide Web ........... www. norcold.com/cda
NORCOLD®
P. O. Box 4248
Sidney, OH 45365-4248
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