Frymaster, a member of the Commercial Food Equipment Service Association, recommends
using CFESA Certified Technicians.
Price: $6.00
24-Hour Service Hotline
* 8 1 9 6 6 0 6 *
819-6606
OCT 10
1-800-551-8633
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Table of Contents
Theory of Operation
1-1
2-1
3-1
4-1
5-1
Service/Software Procedures
Troubleshooting
Illustrated Parts List
Wiring Diagrams
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Cabinet Service Procedures
1 Functional Description
Master Control Display
Power switch
Timer: displays on row
board remaining time for
all active timers.
Temperature: displays on
row board plate
Row Mode key
temperature, alternating
between top and bottom.
Timer keys
Timer key
Note: The illustrations for
these service procedures
are of the 6‐row full size
UHC‐HD.
1.2 Theory of Operation
The cabinet operates on 208-250VAC 50 or 60 cycle single-phase power. The main switch activates
a relay, which supplies line voltage to two distribution boards, three cooling fans and a power
supply. The power supply provides 5VDC to the master control board and the distribution boards.
A ribbon cable connects the master control board to both distribution boards. Ribbon cables also
connect the distribution boards to the displays. The resistance of RTD’s, attached to the heater
plates, is monitored by the distribution boards. The board switches power through solid-state relays
to the heater plates when the resistance, which is used as an indicator of temperature, falls out of the
range for the product held in the cabinet.
The switch, relay, master control, master control board, LON board, LON filter, cooling fans and
power supply are mounted under the top of the unit. The cabinet is programmed using the key pad
on the front bezel.
1-1
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Cabinet Service Procedures
1.3 Start Up Indicators and Test Points
Distribution boards
shown with ribbon
cables removed.
Upon startup, the cabinet beeps. LED’s on the distribution boards flash. The displays show the
version number of the cabinet’s firmware and then the row’s status.
1-2
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Cabinet Service Procedures
2 Service Procedures
DANGER: Failure to disconnect power from the unit before servicing could result in serious
injury or death. The cabinet power switch DOES NOT disconnect all incoming power to the
cabinet.
Fig. 2: Tabs in the topcap extend to
holes in the cabinet. The top is secured
with at the tabs with screws.
Fig. 1: The sides
are held in place
by screws near
the base of the
unit on each side.
2.1 Updating Software/Capturing Configurations
The five sections of software on the cabinet can be updated individually. To ensure compatibility between cabinet
software and replacement boards, the software should be updated to the latest version at any board replacement. Follow
the directions below.
Keypad: Enter
programming
Power Switch: Cycle
power between each
revision update.
OK: Press to confirm
choices.
Arrows: Scroll to
choices.
Programming key:
Press prior to entering
programming code.
Software updates use the master control display to enter programming codes, scroll to areas to be revised, respond to
questions and exit. The control is annotated above. The arrow and OK buttons are illuminated when active.
Check Existing Versions
NOTE: If the master control
displays an error message
during the install process, turn
the cabinet off for 30 seconds
and back on. Repeat install
steps.
1. With the unit powered up, press the programming key.
2. Screen scrolls Enter Access Sequence.
3. Enter 090809 on keypad.
4. Press OK.
5. Scroll with arrow keys to view all software revision numbers:
•
•
•
•
•
Main
Boot Loader
Master Display
Distribution Board
Row Display
6. Press OK.
2-1
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Cabinet Service Procedures
Update: Boards
Loading Sequence
Software should be loaded in this
sequence:
1. Turn power off.
2. Insert flash drive in USB port located on cabinet bezel.
3. Turn power on.
4. Cabinet displays version numbers followed by current menu
setting.
5. Press programming key.
6. Screen scrolls Enter Access Sequence.
7. Enter 98765 with keypad.
8. Press OK.
9. Scroll with arrow key until software section (see loading
sequence box) to be updated is displayed on master control
board.
•
•
•
•
Main Board
Language
Row Display
Distribution Boards
If the software update only involves a few
of the components, following the loading
sequence, skipping the unneeded
component.
10. Press OK.
Incompatibility Message
The cabinet can display an incompatibility
message during software upgrades. The
buttons will remain active. Follow the
loading sequence and the incompatibility is
corrected as the software components are
loaded.
11. Screen displays Copying Files, Please Wait. This takes
several minutes.
12. Screen messages will vary, depending on software section
being installed. Follow screen instructions.
13. Screen displays Complete.
14. Press OK.
15. Screen displays Main Boot Loading and a percentage of
completion.
16. After 100% is displayed, screen goes blank and returns to menu display.
17. Turn cabinet off for 30 seconds and back on.
Update: Language File
1. With the unit on, press program button.
2. Enter 090709 with the keypad.
3. Press OK.
4. Screen displays Reconfigure OK or Cancel.
5. Press OK.
6. Screen displays Please Wait Lang Bin.
7. Screen displays 9 files copied.
8. Press OK.
9. Screen returns to normal display.
10. Turn cabinet off for 30 seconds and back on.
Capture Cabinet Menus/Configurations
The menu items and cabinet configurations in a cabinet can be captured and used to configure
cabinets with identical software setups. Follow the instructions below to capture the menus and
configuration from a cabinet.
1. Insert an empty flash drive in the
USB socket on the cabinet with
menus and configurations to be
copied.
2. Press the programming key.
3. Enter 759248 with the keypad.
4. Press OK.
5. The master control will display
Copy from UHC to
The configuration of a cabinet can be captured on an empty
flash drive for transfer to cabinets with the same software
setup.
2-2
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Cabinet Service Procedures
USB.
6. Press OK.
7. The master control displays Please Wait… as files are transferred to the flash drive,
changing to the number of files copied when the process is complete.
8. Press OK.
9. Remove flash drive.
10. Cabinet returns to normal display.
Configure Cabinet with Menu/Configuration Captured on another Cabinet
1. Place a flash drive with only a captured
menu/cabinet configuration in the root file
into the USB port of a cabinet to be
identically configured.
2. Press the programming key and enter
090709 with the keypad.
3. Press OK.
4. The master control will display
Reconfigure OK or
Cancel.
A cabinet configuration can be transferred to multiple
cabinets with a captured configuration held on a flash
drive.
5. Press OK.
6. The master control will display Please wait…as the files are updated, changing to the
number of files copied.
7. Press OK.
8. The cabinet will return to the original menu setting, changing row position displays to match
items introduced with the configuration transfer.
Cabinet Access Codes
Code
Function
759248
Capture cabinet configuration to flash drive
98765
1955
Load software updates from USB drive
Enter manual programming mode (see operation manual).
LON Works service pin
4557
090809
1111
View software versions
Service test mode
090709
Update language file
2-3
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Cabinet Service Procedures
2.2 Placing the cabinet in Service Mode
The cabinet can be put in service mode, a
diagnostic settings which allows the heater plates
to be controlled individually, brightness settings on
the displays adjusted and re-addressing for unique
arrangements of bezels. Follow the steps below :
Switching Heater Plates Off Individually
When troubleshooting, it may be useful to switch heater plates off individually. Follow the
instructions below:
1. Press the programming key.
2. Enter 1111 at the Enter Access Sequence prompt.
3. The screen will scroll Row 1 Top Heater Off; pressing OK turns it back on.
4. Voltage can be measured between the plate-specific heater leads on the distribution board
and the common block to the right of the distribution board as the heater plates are switched,
individually, on and off.
5. Scroll to other plates with WX.
6. Ensure the plates are on before backing out of the Service Mode with the /.
Adjusting Display Brightness
When multiple row positions are timing the same item, the display with the least remaining time is
the brightest. All others are dimmer as are positions not actively timing a product. The relative
brightness of the bright display and the dim display can be adjusted. Follow the instructions below:
1. Press the programming key.
2. Enter 1111 at the Enter Access Sequence prompt.
3. Press OK.
4. The screen will scroll Row 1 Top Heater Off.
5. Scroll with X through all the Heater Plate prompts until the screen displays Press OK to
Adjust Bright Row Display.
6. Press OK.
7. The cabinet’s row displays become
Decrease
Increase
88888 20
8. Press the timer button next to the Decrease display to lessen the brightness; the number
displayed at the right will decrease. Press the timer button next to the Increase display to
increase the brightness; 20 is the maximum.
9. Press OK. The display becomes Adjust Dim Intensity. The cabinet’s row displays become
Decrease
Increase
88888 03
10. Press the timer button next to the Decrease display to lessen the brightness; the number
displayed at the right will decrease. Press the timer button next to the Increase display to
increase the brightness; 1 is the minimum.
11. Press OK.
12. Cabinet returns to menu display.
2-4
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Cabinet Service Procedures
Readdressing the Cabinet
Addressing, or assigning a position-specific component such as a display or distribution board, is
done automatically by the cabinet on startup. Communication errors can occur on start-up after a
board installation however. If so, follow the instructions below to readdress the cabinet. This process
can also be used during troubleshooting when displays are connected out of synch with their
associated bezel on the same row level.
1. Press the programming key.
2. Enter 1111 at the Enter Access Sequence prompt.
3. The screen will scroll Row 1 Top Heater Off.
4. Scroll with X through all the Heater Plate prompts until the screen displays Press OK to Re-
Address.
5. Press OK.
6. Screen Displays Please Power Cycle Off.
7. Turn the cabinet off and back on.
8. The cabinet will start in the normal start-up sequence.
2-5
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Cabinet Service Procedures
2.3 Accessing the Electronic Components
1. The component shelf is accessed by removing two screws on each side of the unit (Fig. 1).
2. Lift and remove the sides, which exposes screws that hold the top in place (Fig. 2).
3. The components are annotated below (Fig. 3).
Master
Display
Board
NOTE: The cooling fans
LON board
rest on ducts, and cool
Master Control
Board
specific regions of the
LON
filter
Cooling
fans
LON
filter
Power
supply
Figure 3
All the components are readily removed. There are no replaceable components on the circuit boards.
2.4 Circuit Board LED Diagnostics
Master Control Board:
• HB LED is a heartbeat; should
be flashing when in the normal
in- use mode. Flash rate is not
critical.
Fig. 4: Master Control Board LED's
• ACT LED similar to HB but
flashes at a faster rate.
• OK LED toggles each time a valid communication packet is sent and received. Normally a
very fast flicker.
2-6
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Cabinet Service Procedures
• ERR LED toggles when a communication error is detected; it’s not unusual to see a flash,
but regular flashing means communications problems.
• LED5 and LED6 used for programming/debugging; have no diagnostic function.
• LED7 When lit, the master control is executing a time or temp query operation on the front
side.
• LED8 When lit, the master control is executing a time or temp query operation on the back
side.
Distribution Board
• HB LED is a heartbeat LED; toggles on / off to indicate
processor is running.
• ACT LED flashes when it receives a valid communication
packet; it should be flashing every few seconds or faster.
• LED3 Toggles if there is a communications error on a packet
directed to the distribution board. Can flash on occasion;
shouldn’t flash regularly.
• LED1 flashes if there is voltage being applied to one or more
heaters on that distribution board; one or more plate is calling
for heat.
Fig. 5: Distribution Board LED's
2.5 Tests
2.5.1 Power Supply
Sensor
(°F)
60
70
80
90
Sensor
(°C)
Resistance
1. Disconnect power and check all terminals and
connections for loose or disconnected wires.
106.065
108.224
110.380
112.532
114.680
116.825
118.966
121.104
123.239
125.369
127.496
129.620
131.740
133.856
135.969
138.078
140.184
142.286
144.385
146.480
148.570
15.55
21.11
26.66
32.22
37.77
43.33
48.88
54.44
60.00
65.55
71.11
76.66
82.22
87.77
93.33
98.88
104.44
110.00
115.55
121.11
126.66
2. Apply power and check for 5VDC at the power-in
terminal on the distribution board and chassis
ground.
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
260
2.5.2 RTD
1. Remove the leads from the suspect RTD and test for
resistance. Selected temperatures and resistances are
show in chart at right.
NOTE: After testing, reconnect all leads to their
original positions.
2.5.3 Distribution Boards
1. Check for line voltage between the heater plate
terminal on the board and the terminal block for the
RTD resistance chart
2-7
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Cabinet Service Procedures
suspect heater. Note: Line voltage is only seen when the row is calling for heat.
2. Check for line voltage between the
power input terminal and the terminal
block.
3. Check for +5VDC at the power-in
terminal and the terminal block for the
power supply.
NOTE: After testing, reconnect all
connections to their original positions.
2.5.4 Display
1. Remove power from unit.
2. Connect the ribbon cable from a
suspect display to the connector of a
properly working display to isolate the
problem to the display or the
distribution board.
3. Reapply power to cabinet.
2.5.5 Shorted Triac
Fig. 6: Distribution board shown with display cables removed.
1. Turn the suspect row off and measure
voltage between the suspect heater lead on the distribution board and the terminal block. With
the row off, there should be no line voltage. If the triac is shorted, you will measure AC line
voltage. If the triac is half waving, you will get DC voltage of approximately one-half the line
AC voltage.
2.5.6 Heater Plate
1. Disconnect power to the cabinet. Remove side and top panels. Disconnect the black heater lead
and the RTD leads (brown and red) of the suspect plate from distribution board. Measure
resistance of the heater from the black lead to any terminal on the white terminal block.
Resistance should be 140-150 ohms.
2. Measure resistance across the brown and red RTD leads. Resistance must be within a range of
104-148 ohms. Resistance at room temperature is approximately 107 ohms. See chart on Page
2-4 for resistance at different temperatures. If either resistance is incorrect, replace the heater
plate.
2.5.7 Display Meanings
1. ROW TEMP HIGH OR ROW TEMP LOW and no audible alarm. This is normal when
the row is changing temperature in association with a menu change.
2. LLLL means the RTD indicates a temperature below 50°F (10°C). Unit will automatically heat
at 20 percent until temperature is above 50°F (10°C), then operate normally.
2-8
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Cabinet Service Procedures
3. HHHH means RTD indicates the temperature is above 255°F (124°C), but below "Open" circuit
resistance, which causes S EN S ALARM.
4. UHC VERS ION _ _ _ (version number will vary)
appears for five seconds when the unit is turned on.
5. The cabinet also displays a variety of error messages, which are
shown on page 3-1.
2.6 Removing/Replacing Bezels
1. Remove power from unit.
2. Remove screws at the base of each side and remove side
panels. (See figure 7.)
3. Unplug the bezel from the distribution board.
Fig. 7: Two screws (see arrows) at the
4. Plug the replacement bezel into the distribution board,
base of each side of the cabinet secure
return power to the unit and test the bezel/cabinet for
the sides.
accurate operation.
5. Remove replacement bezel and remove power from the unit.
6. Loosen the hex nut which secures the row and remove the allen screw, which holds the
bezel. Also remove, if present, the small bezel-securing screw. (See photo below.)
7. Push, if necessary, on the mounted bezel through the access port in the inner panel to
loosen the bezel. (See Figure 8 below.)
8. Remove bezel; clean and degrease the groove in the heater plate.
9. Route ribbon cable for the new bezel through the inner panel of the cabinet and press the
new bezel into place. Ensure it is firmly seated and tighten hex nuts and replace allen
screws.
10. Return sides and reposition cabinet for operation.
Fig. 8: Loosen the hex bolt and
remove the allen screw (arrows,
upper photo). Some row positions
may have an additional screw
securing the bezel to the cabinet
(lower photo). Push through the
access port (arrow, upper photo), if
necessary, to remove the bezel
from the cabinet .
2-9
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Cabinet Service Procedures
2.6. 1 Removing/Replacing a Distribution Board or Communication Board
1. Remove power.
2. Remove and mark the wires on the faulty component.
3. Remove the board by lifting it from its
standoffs.
4. Position the new board and attach
wires.
5. Reapply power.
6. Run readdress steps on page 2-4.
2.6.2 Removing a Row
1. Remove the sides and top as shown in
earlier steps. Disconnect the faulty row
from the distribution board, and
terminal block.
2. Remove the bezels on each end of the
affected row, as shown in earlier steps,
and the necessary adjacent bezels to
remove the row.
Fig. 9: A row is shown partially removed from the cabinet.
3. Remove wire wraps from wiring
harness holding heater and control
wires for affected row.
4. Lifting slightly, carefully slide the malfunctioning row out of the cabinet. Do not allow the row
to contact or damage the controls of the unit below (Fig. 9).
2.6.3 Replace Heater Plate/RTD
1. Remove row as shown above.
2. Run your fingers around the outside surface of the row assembly. There are four raised areas.
These are the setscrews, which hold the heater plate to the spacer. Punch holes in the insulation,
directly above the location of the setscrews. (Fig. 10, 11).
3. Use an allen wrench to loosen the four spacer-setscrews along the edges of the plate.
4. Slide the malfunctioning plate out of the spacer.
5. Slide the replacement plate into position. Make
sure the plate is inserted squarely. Tighten set
screws.
6. Route the wires to one end of the row and wire tie
the power wires together. Also wire tie the RTD
wires together. Stand the row on the opposite end
adjacent to the cabinet and feed the wires into the
cabinet.
7. Carefully slide the row far enough into the cabinet
to be stable.
Fig. 10, 11: Find the set screws under the foil
insulation and push through with an allen wrench.
8. On the opposite side, reach into the cavity and
direct the wires through the appropriate grommets
to reach the power and RTD connections on the distribution board.
2-10
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Cabinet Service Procedures
9. Slide the row assembly completely into the
cabinet and return the spacers between the heater
plates. Ensure the row is evenly positioned in the
cabinet. There must be sufficient space to allow
the bezel tabs to fit between the outside row plate
and the cabinet interior wall.
10. Replace the bezels.
Fig. 12: The heater plate slides from the insulation.
CAUTION
Ensure the heater plate setscrews are tightened securely to the spacer.
Tightening the setscrews will ensure the plate is properly grounded.
2-11
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Cabinet Troubleshooting
The master control display and the row displays show error messages when there is a problem. The
messages are shown in the matrix below along with possible causes and diagnostic tests.
Error Message
Cause
Tests
The master control board has lost
communication with the specified
board.
•
•
Turn the cabinet off and back on.
Ensure there are no software
incompatibilities.
Call service row display
error
Row number also displayed *
•
•
Inspect ribbon cable connections.
The master control board has lost
communication with the top
distribution board.
A display connection can produce
this display. Before replacing a
distribution board, remove power
from the unit and disconnect the
displays from the affected
Call service distribution
board 0 error*
distribution board. Return power
to the unit and, one at a time, plug
in the displays, cycling power each
time. If the problem is display‐
related it will go away with the
affected display disconnected.
The master control board has lost
communication with the bottom
distribution board.
Call service distribution
board 1 error*
•
Turn the cabinet off and on, which
can clear the problem if it is
software related.
Row’s top plate failed to reach
required temperature in prescribed
time window after startup or when
switching between menus.
•
•
Check top plate RTD output against
chart on page 2‐4.
Enter service code (see page 2‐1)
and switch top plate on and off to
ensure it is responding to cabinet
circuits.
Call service rate of
rise top**
•
Turn the cabinet off and on, which
can clear the problem if it is
software related.
Row’s bottom plate failed to reach
required temperature in prescribed
time window after startup or when
switching between menus.
•
•
Check bottom plate RTD output
against chart on page 2‐4.
Enter service code (see page 2‐1)
and switch bottom plate on and off
to ensure it is responding to
cabinet circuits.
Call service rate of
rise bot**
•
•
•
Compare plate temperature to
displayed temperature.
Compare plate RTD resistance to
chart on page 2‐4.
Switch plate on/off with service
code to ensure it is responding to
cabinet circuits.
With plate on and calling for heat,
check amp draw on leads between
distribution board and heater
plate. Amp draw on a properly
functioning plate should be 1.67.
Call service top row temp
too high**
Call service bot row temp
too high**
Call service top row temp
too cool**
Call service bot row temp
too cool**
RTD sensor is producing a reading
that is out of range. The problem can
be a failed RTD, heater or
•
Call service top sensor
error hi temp**
distribution board.
Call service bot sensor
error hi temp**
Call service top sensor
error low temp**
Call service bot sensor
error low temp**
* Shown on master control display. ** Shown on affected row display.
3-1
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Cabinet Troubleshooting
Failure modes not accompanied by a master control display are shown below with possible causes
and tests.
Symptom
Possible Causes
Tests
• No power to cord.
• Blown 20 amp fuse.
• Circuit breaker open.
• Check for line voltage at the switch
Unit fails to power
up; fans don’t run.
and the transformer.
• Reset circuit breaker.
Unit powers up and • Broken or improperly
• Switch ribbon cable from functioning
display to failed component to isolate
problem.
fans run; a display
fails to light.
seated ribbon cable.
• Defective display.
Unit powers up and
fans run; all
displays fail to light.
• Check for 5VDC at communication
• Failed power supply.
board and distribution boards.
• Ensure heater leads and power inputs
on the distribution boards are properly
seated.
• Test for 208VAC input on distribution
board and 208VAC output from heater
leads to heater plate when the unit is
calling for heat.
• Improper wiring on
distribution board.
Rows heat
improperly or not at
all.
• Defective distribution
• Switch power leads from properly
operating row to faulty row to isolate
problem.
board.
• Defective heater.
• Defective sensor.
• Check resistance of RTD lead against
temperature chart. See Page 2-4.
• Switch RTD lead from properly
operating row to faulty row to isolate
problem.
• Test continuity of heater plate.
3-2
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Cabinet Parts
Parts Lists, Exploded Views
3
1
2
4
7
6
8
5
9
11
10
12
13
14
Part Number
Description
Item
1
2
3
4
5
6
7
*
108-1897
823-7636
807-4882
807-5111
807-4911
823-7513
807-5112
807-5156
Top Cap
Rear Fascia
Circuit Breaker, 16 amp
Time/Temperature switch
Power switch
Front fascia
Master control overlay with ribbon cable
Master display board (circuit board in master display assembly)
4-1
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Cabinet Parts
Part Number
Description
Item
8
9
807-5111
826-2781
826-2782
108-1190
807-4857
807-4860
108-1633
108-1632
Time/Temperature switch
Bezel, with boards, front with short ribbon cable
Bezel with boards, rear, with long ribbon cable
Base
*
10
11
12
13
14
Heater plate/RTD
Distribution board
Side, left, vented
Side right, not vented
Component Shelf
15
20
16
19
17
18
Part Number
Description
Item
15
16
17
*
807-5150
807-2665
807-4951
807-4952
Master control board
Blower
LON board, domestic
LON board, international
4-2
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Cabinet Parts
Part Number
Description
Item
18
807-4868
807-3490
406-0011
Power Supply
Power relay
19
20
UHC-HD Single Filter Board
Ribbon Cables
*
*
807-4916
807-4917
807-4875
807-4922
807-4923
Time/Temp 18” used for front fascia
Time/Temp 32” used for rear fascia
Master distribution
*
*
*
Power to upper distribution board
Power to lower distribution board
*
*Not Illustrated
4-3
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Cabinet Wiring Diagrams
Wiring Diagram, Delta Power, L1-L2
5-1
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Cabinet Wiring Diagrams
UHC-HD, WYE Power, L1-N
5-2
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Frymaster, L.L.C., 8700 Line Avenue, Shreveport, Louisiana 71106
TEL 1-318-865-1711
FAX (Parts) 1-318-219-7140
FAX (Tech Support) 1-318-219-7135
Price: $6.00
819-6606
SERVICE HOTLINE
1-800-551-8633
PRINTED IN THE UNITED STATES
OCT 2010
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