H10X/H5X
H5E/DV PC
H5 ELEMENT
With Digital Control Board
SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
To ensure you have the latest revision of the manual or to obtain the illustrated parts catalog, please visit
the latest catalog and manual updates. Contact Bunn-O-Matic Corporation at 1-800-286-6070 to obtain
a paper copy of the required Illustrated Parts Catalog mailed via U.S. Postal Service.
42311.0000E 09/13 © 2011 BUNN-O-MATIC CORPORATION
WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualified service
personnel. Disconnect the dispenser fromthe power source when servicing, except when electrical tests are
required and the test procedure specifically states to connect the dispenser to the power source.
CONTENTS
TroubleShooting............................................................................................4
Component Access .......................................................................................7
Electronic Controls...................................................................................8-11
Limit Thermostat.........................................................................................12
Safety Overflow Switch...............................................................................13
Solenoid Valve (Late Models)......................................................................14
Solenoid Valve (Early Models) ....................................................................15
Tank Heater.................................................................................................16
Steam Sensor .............................................................................................17
Dispense Valve (PC)....................................................................................18
Schematic Wiring Diagrams........................................................................19
42311 071310
3
TROUBLESHOOTING
A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems
encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic
Technical Service Department.
•
•
•
Inspection, testing, and repair of electrical equipment should be performed only by qualified service person-
nel.
All electronic components have 120 – 240 volt ac and low voltage dc potential on their terminals. Shorting
of terminals or the application of external voltages may result in board failure.
Intermittent operation of electronic circuit boards is unlikely. Board failure will normally be permanent. If
an intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a
terminal or crimp.
•
•
Solenoid removal requires interrupting the water supply to the valve. Damage may result if solenoids are
energized for more than ten minutes without a supply of water.
The use of two wrenches is recommended whenever plumbing fittings are tightened or loosened. This will
help to avoid twists and kinks in the tubing.
•
•
Make certain that all plumbing connections are sealed and electrical connections tight and isolated.
This dispenser is heated at all times. Keep away from combustibles.
WARNING
• Exercise extreme caution when servicing electrical equipment.
• Disconnect dispenser from the power source when servicing, except when electrical tests are specified.
• Follow recommended service procedures
• Replace all protective shields or safety notices
When a fault occurs (failure to the unit) the POWER lamp will
flash to identify the problem (early models)
FAULT CODES
Flashes
1
2
Description of Failure
Temperature Sensor (short)
Temperature Sensor (open)
Er1 Temperature Sensor (short)
Er2 Temperature Sensor (open)
Er3 Refill Fault (continuous refill for 15 minutes) 3
Er4 Heater Fault (heater relay on for 120 minutes) 4
Refill Fault (continuous refill for 15 minutes)
Heater Fault (heater relay on for 120 minutes)
Boil Thermistor (short) H5X/H10X only
Boil Thermistor (open) H5X/H10X only
Er5 Boil Thermistor (short) H5X/H10X only)
Er6 Boil Thermistor (open) H5X/H10X only)
5
6
Probable Cause
Remedy
Problem
1. No power or incorrect voltage (A) Check the terminal block for the cor-
rect voltage. It should be:
Equipment will not operate.
a.) 100 to 120 volts ac across the black
and white terminals for 100 to 120 volt
models or,
b.) 200 to 240 volts ac across the red and
black terminals for 200 to 240 volt models
or,
c.) 230 volts ac across the red and black
terminals for 230 volt models.
(B) Check circuit breakers or fuses.
42311 071310
4
TROUBLESHOOTING (cont.)
Problem
Probable Cause
Remedy
Equipment will not operate 2. Safety overflow switch
(cont.)
Refer to Service – safety overflow switch
for testing procedures.
Automatic refill will not oper- 1. No water
ate after drawing hot water.
Check plumbing and shut-off valves.
2. Water strainer/flow control
(A) Direction of flow arrow must be point-
ing towards dispenser.
(B) Remove the strainer/flow control and
check for obstructions. Clear or replace.
3. Liquid level system
4. Solenoid valve
Refer to Service – electronic controls for
testing procedures.
Refer to Service – solenoid valve for test-
ing procedures.
Water flows into the tank con- 1. Solenoid valve
tinuously (Dispenser discon-
Refer to Service – solenoid valve for test-
ing procedures.
nected from power source).
Water flows into the tank con- 1. Liquid level system
tinuously (Dispenser connect-
Refer to Service – electronic controls for
testing procedures.
ed to power source).
Water is cold.
1. Safety overflow switch
2. Limit thermostat
Refer to Service – safety overflow switch
for testing procedures.
Refer to Service – limit thermostat for
testing procedures.
CAUTION – Do not eliminate or bypass limit thermostat. Use only B.O.M. replacement part #23717.0003.
3. Tank heater
Refer to Service – tank heater for testing
procedures.
4. Temperature control
Refer to Service – electronic controls for
testing procedures.
42311 071310
5
TROUBLESHOOTING (cont.)
Problem
Probable Cause
Remedy
Water boils continuously.
1. Temperature control
Refer to Service – electronic controls for
testing procedures.
2. Lime build-up
Inspect the tank assembliy for excess lime
deposits. Delime as required.
CAUTION – Tanks and tank components should be delimed reglarly depending on local water conditions. Exces-
sive mineral build-up on stainless steel surfaces can initiate corrosive reactions resulting in serious leaks.
Dispenser is making unusual
noises.
1. Plumbing lines
3. Water supply
Plumbing lines should not be resting on
the counter top.
(A) The dispenser must be connected to a
cold water line.
(B) Water pressure to the dispenser must
not be higher than 90 psi (620 kPa). Install
a regulator if necessary to lower the work-
ing pressure to approximately 50 psi (345
kPa).
Ready indicator will not light.
1. Temperature control
2. Ready Indicator LED
Refer to Service – electronic controls for
testing procedures.
Replace the indicator LED.
42311 071310
6
SERVICE
WARNING – Disconnect the dispenser from the power source before the removal of any panel or the replacement
of any component. WARNING - Inspection, testing, and repair of electrical equipment should be performed only
by qualified service personnel. Disconnect the dispenser fromthe power source when servicing, except when
electrical tests are required and the test procedure specifically states to connect the dispenser to the power source.
Component Access - H5E/DV-PC/X
Component Access - H10X
ARNING
ater
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ery Hioth Care!
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Use
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P1770.30
The check valve, electronic control assembly, safety
overflow switch, solenoid valve, overflow tube tempera-
ture sensor and terminal block are located at the rear of
the dispenser. Access is gained by removing the upper
and lower rear panels. The upper is attached with six
8-32 slotted-head screws. The lower is attached with
four 8-32 slotted-head screws. The middle panel must
not be removed from the dispenser.
P878.30
The check valve, electronic control assembly, over-
flow protection switch, solenoid valve, overflow tube
temperature sensor, triac assembly (EARLY MODELS
ONLY) and terminal block are located on the side of
the dispenser. Access is gained by removing the side
panel. The panel is attached with eight 8-32 slotted-
head screws.
Faceplate Removal - H5 ELEMENT: After removing
top cover, remove the two upper screws securing the
faceplate. Carefully lift faceplate straight up until the
three lower screws clear the key holes.
7
42311 022311
SERVICE
Liquid Level Control Flow Charts
Electronic Controls
H5E, H5X LIQUID LEVEL CONTROL
PROBLEM: Does Not Refill
Yes
Overflow Cup Full
?
Remove Power
Drain cup
Retry
No
Disconnect Level Probe
Yes
Yes
Voltage present at
Solenoid Valve
?
Does Water Flow
?
Replace Probe
No
No
H 5
Unplug Ready Lamp
Replace Solenoid Valve
P4093.35
Yes
Voltage present at
Solenoid Valve
?
FIG. 8a ELECTRONIC CONTROL
Replace Ready Lamp
No
Replace Control Board
Triac Assy
H5E, H5X LIQUID LEVEL CONTROL
PROBLEM: Overflows
Drain cup
Unplug Ready Lamp
Retry
Electronic
Control Board
2
0)
.
#26.750)
rlo#
otaingpsure
ahser
90psigmax
B
(RplScren#3721.
o
(Rep.FlowW
No
Overflow
?
Replace Ready Lamp
Yes
H 10
Drain cup
Disconnect Probe
Wire From Probe
Short Probe Wire
To Chassis
P1991-1.30
FIG. 8b ELECTRONIC CONTROL
BOARD AND TRIAC
Retry
Location:
No
Overflow
?
Replace Probe
The electronic control board is located inside the
rear of the dispenser. Access will also be needed to the
temperature sensor, overflow tube temperature sensor,
and liquid level probe located on the tank lid.
Yes
Drain cup
Disconnect Wire From
Solenoid Valve
Retry
General:
Yes
Overflow
?
Replace Solenoid Valve
This system controls the liquid level and water
temperature of the dispenser. These two functions
act independently of each other and should be tested
separately.
No
Replace Control Board
42311 071310
8
SERVICE (cont.)
Electronic Controls (cont.)
Liquid Level Control Test Procedure
4. Remove the pink wire from terminal 5 of the elec-
tronic control assembly.
5. Check the voltage across terminals 1 & 4 of the
electronic control board with a voltmeter. Connect
the dispenser to the power source. The indication
must be:
1. Disconnect the dispenser from the power source.
2. Check the voltage across terminals 3 & 4 of the
electronic control board with a voltmeter. Connect
the dispenser to the power source. The indication
must be:
a.) 100 to 120 volts ac for 100 to 120 voltmodels
or
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
or
c.) 230 volts ac for 230 volt models
after a delay of approximately 5 seconds.
6. Disconnect the dispenser from the power source.
c.) 230 volts ac for 230 volt models.
3. Disconnect the dispenser from the power source. If
voltage was present as described, proceed to #4. If
voltage was not present as described, refer to the
Wiring Diagrams and check the dispenser wiring
harness.
If voltage was present as described, the liquid level con-
trol of the system is operating properly, proceed to #7.
If voltage was not present as described, replace the
electronic control board and the temperature sensor
in the tank lid.
SERVICE (cont.)
Temperature Control Flow Charts
42311 071310
9
Electronic Controls (cont.)
If voltage was not present as described, check the pink
probe wire and the green ground wire for continuity
and/or replace the probe.
7. Reconnect the pink wire to terminal 5 of the elec-
tronic control assembly.
8. Loosen the compression fitting, remove the probe
from the tank lid, and inspect it for mineral depos-
its. Replace it if necessary. Keep the exposed ends
of the probe away from any metal surface of the
dispenser.
9. Check the voltage across terminals 1 & 4 of the elec-
tronic control assembly with a voltmeter. Connect
the dispenser to the power source. The indication
must be:
Temperature Control Test Procedure
1. Disconnect the dispenser from the power source.
2. Check the voltage across terminals 3 & 4 of the
electronic control circuit board with a voltmeter.
Connect the dispenser to the power source.The
indication must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
or
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
or
c.) 230 volts ac for 230 volt models.
3. Disconnect the dispenser from the power source.
4. Check the voltage across the tank heater terminals
with a voltmeter. Connect the dispenser to the
power source. The indication must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
or
c.) 230 volts ac for 230 volt models.
5. Disconnect the dispenser from the power source.
c.) 230 volts ac for 230 volt models after a delay
of approximately 5 seconds.
10. Touch the screw head end of the probe to the dis-
penser housing. The indication must be 0.
11. Move the probe away from the dispenser housing.
The indication must again be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
or
c.) 230 volts ac for 230 volt models
after a delay of approximately 5 seconds.
12. Disconnect the dispenser from the power source.
Temperature Control Flow Charts (cont.)
If voltage was present as described, reinstall the probe,
thesensingfunctionofthesystemisoperatingproperly.
H5E THERMOSTAT
PROBLEM: Boils
H5X THERMOSTAT
PROBLEM: Boils Excessively - Fills Cup
Drain cup
Retry
Drain cup
Retry
Yes
Yes
Red Light On While
Red Light On While
Replace Control Assembly
Replace Steam Sensor
Boiling
?
Boiling
?
No
No
Disconnect Blue Wire From
Control Board Pin 7
Yes
Disconnect Blue Wire From
Control Board Pin 7
Still Boiling
?
Replace Control Assembly
Retry
Retry
No
Finished
Yes
Still Boiling
?
Yes
Still Boiling
?
Replace Triac Assembly
Replace Triac Assembly
Check For Split
Tank Heater
Check For Split
Tank Heater
No
No
Replace Control Board
Replace Control Board
42311 071310
10
SERVICE (cont.)
Electronic Controls (cont.)
If voltage was present as described, the temperature
control of the system is operating properly.
If voltage was not present as described, contact
Bunn-O-Matic to order an electronic control board and
temperature sensor for evaluation and proceed to #9.
6. Replace the electronic control board.
T5 PNK to Liquid
Level Probe
7. Check the voltage across the tank heater terminals
with a voltmeter. Connect the dispenser to the
power source. The indication must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
T4 WHI or RED to
Terminal Block
BLU to Tank
Heater
T3 BLK to Overflow
Safety Switch
T2 GRN or GRN/YEL
to Chassis Ground
WHI/VIO to
Terminal Block
b.) 200 to 240 volts ac for 200 to 240 volt models
or
T1 WHI/BLU to
Solenoid
c.) 230 volts ac for 230 volt models
J5 GRY & GRY toTherm-
istor (H5X only)
J4 BLK & WHI to
Temperature Sensor
8. Disconnect the dispenser from the power source.
If voltage was present as described, the temperature
control of the system is operating properly. Return the
new electronic control board or temperature sensor to
Bunn-O-Matic for credit.
J3 PNK & GRY to
Heater Indicator
Refill Indicator
Power Indicator
Ready Indicator
Electronic Controls Removal and Replacement
FIG. 11a WIRING CONNECTIONS
Adjustments
1. Remove all wires from the electronic control board
terminals.
2. Remove the six 6-32 screws holding the electronic
control board to the component bracket.
3. Disconnect the temperature sensor, overflow tube
temperature sensor, and indicator wires from the
electronic control board.
4. Attach the temperature sensor, overflow tube
temperature sensor, and indicator wires to the
electronic control assembly.
5. Fasten the new electronic control board to its
bracket.
The H5X/H10X dispensers hold the water tempera-
ture at the threshold of boiling. It is not adjustable by
the user.
The H5E dispenser is factory calibrated for the
temperature specified on the data plate. If adjustment
is required, use the following procedure:
1. Fill the dispenser according to the steps in the Initial
Set-up.
2. Take the temperature of the stream of water im-
mediately below the faucet as it flows from the
dispenser with an accurate thermometer. Do not
take the temperature of water collected in a con-
tainer.
6. Refer to Fig 2 when reconnecting the wires.
7. Review the initial set-up procedures on page 6.
3. If any adjustment is required, refer to LEVEL 1
PROGRAMMING in the Operating Manual.
42311 071310
11
SERVICE (cont.)
If voltage was present as described, reconnect the black
wire and proceed to #5.
Limit Thermostat
Location:
If voltage was not present as described, refer to the Wir-
ing Diagrams and check the dispenser wiring harness.
The limit thermostat is located on the tank lid.
To test the limit thermostat, access will also be needed
to the terminal block located at the rear of the dispenser. 5. Check for continuity across the terminals of the
limit thermostat.
If continuity is not present as described, the circuit is
broken. Press the reset button of the limit thermostat
and recheck for continuity.
If continuity is not present as described, replace the
limit thermostat.
H 5
Removal and Replacement:
P4093
1. Remove both wires from the limit thermostat ter-
minals.
FIG. 12a LIMIT THERMOSTAT
2. Remove the two #10-32 nuts attaching the limit
thermostat to the top of the tank.
3. Install the new limit thermostat and secure into
place with two #10-32 nuts.
4. Refer to FIG. 4 when reconnecting the wires.
H 10
Reset
BLK to Terminal Block
P1993
FIG. 12b LIMIT THERMOSTAT
BLK to Tank Heater
Test Procedure:
P1776
1. Disconnect the dispenser from the power source.
2. There are two black wires on the limit thermostat
terminals. One comes from the terminal block. The
other goes directly to the tank heater terminal. Re-
move the black wire at the limit thermostat coming
from the terminal block.
FIG. 12c LIMIT THERMOSTAT WIRING
3. Check the voltage across the black wire removed
from the limit thermostat and the white wire or red
wire of the terminal block with a voltmeter. Connect
the dispenser to the power source. The indication
must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
or
c.) 230 volts ac for 230 volt models.
4. Disconnect the dispenser from the power source.
42311 071310
12
SERVICE (cont.)
Removal and Replacement:
Safety Overflow Switch
1. Disconnect the black wires from the safety overflow
switch.
2. Remove the nut beneath the copper overflow cup.
3. Remove the entire switch assembly from the cup.
4. Place the new switch assembly into the cup, wires
first. Make sure that a gasket is in place around the
threaded switch stem.
NOTE - The magnets must be at the top of the float and
there must be NO stainless steel washers installed for
the safety overflow switch to operate properly.
H 5
P4093
FIG. 13a SAFETY OVERFLOW SWITCH
5. Install the nut beneath the copper overflow cup.
Be sure not to overtighten.
6. Reconnect the wires, FIG. 6.
RED to BLK Wire from
Terminal Block
H 10
P1993
RED to BLK Wire from Elec-
tronic Control #3
FIG. 13b OVERFLOW PROTECTION SWITCH
P1777
Location:
FIG. 13c SAFETY OVERFLOW WIRING
The safety overflow switch is located inside the rear of
the dispenser inside the copper overflow cup.
For testing or removal of the safety overflow switch,
access may also be needed by removing the two screws
attaching the electronic control assembly to its mount-
ing bracket.
Test Procedure:
1. Once voltage is verified at the power source, check
for continuity across the safety overflow switch
red wires only until the plastic float is raised and
check that continuity returns when the plastic float
is again lowered.
If continuity is present as described, reconnect each
of the red wires to the black wires, the safety overflow
switch is operating properly.
If continuity is not present as described, replace the
safety overflow switch.
42311 071310
13
SERVICE (cont.)
sound after approximately 5 seconds, as the coil
magnet attracts the plunger.
Solenoid Valve (Late Models)
8. Disconnect the dispenser from the power source.
9. Reconnect the pink wire to terminal 5 of the elec-
tronic control board.
Location:
The solenoid valve is located inside the rear of the
dispenser on the right side near the bottom.
To test the solenoid valve, access will also be needed
If the sound was heard as described and water will
not pass through the solenoid valve, there may be a
blockage in the water line before or after the solenoid
valve or the solenoid valve may require inspection for
wear and removal of waterborne particles.
If the sound was not heard as described, replace the
solenoid valve.
to the electronic control board.
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Removal and Replacement:
1. Remove all wires from the solenoid valve coil.
2. Turn-off the water supply to the dispenser.
3. Disconnect the water line from the solenoid valve.
4. Remove the two 8-32 slotted-head screws holding
the solenoid valve and mounting bracket to the back
panel.
H 5
P1778
5. Lift-out the solenoid valve.
6. Securely install the new solenoid valve to the back
panel.
7. Securely fasten the water line to the solenoid valve.
8. Reconnect the wires, FIG. 8.
FIG. 14a SOLENOID VALVE
Test Procedure:
1. Disconnect the dispenser from the power source
and turn-off the water supply to the dispenser.
2. Remove the pink wire from terminal 5 of the elec-
tronic control board.
WHI/BLU to Electronic
Control Board T1
WHI or RED to
Terminal Block
3. Check the voltage across the solenoid valve coil
terminals with a voltmeter. Connect the dispenser
to the power source. The indication must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
or
c.) 230 volts ac for 230 volt models
after a delay of approximately 5 seconds.
4. Disconnect the dispenser from the power source.
If voltage was present as described, proceed to #5.
If voltage was not present as described, refer to the Wir-
ing Diagrams and check the dispenser wiring harness.
FIG. 14b SOLENOID VALVE WIRING
5. Remove both wires from the solenoid valve coil
terminals.
6. Check for continuity across the solenoid valve coil
terminals.
If continuity is present as described, reconnect the wires
and proceed to #7.
If continuity is not present as described, replace the
solenoid valve coil.
7. Check the solenoid valve for coil action. Connect
the dispenser to the power source. Listen carefully
in the vicinity of the solenoid valve for a “clicking”
14
42311 071310
SERVICE (cont.)
Solenoid Valve (Early Models)
If continuity is present as described, reconnect the
wires and proceed to #7.
Location:
If continuity is not present as described, replace the
solenoid valve coil.
The solenoid valve is located behind the large access
panel on the left side of the dispenser.
To test the solenoid valve, access will also be needed
to the electronic control board.
7. Check the solenoid valve for coil action. Connect
the dispenser to the power source. Listen carefully
in the vicinity of the solenoid valve for a “clicking”
sound after approximately 5 seconds, as the coil
magnet attracts the plunger.
8. Disconnect the dispenser from the power source.
9. Reconnect the pink wire to terminal 5 of the elec-
tronic control board.
If the sound was heard as described and water will
not pass through the solenoid valve, there may be a
blockage in the water line before or after the solenoid
valve or the solenoid valve may require inspection for
wear and removal of waterborne particles.
If the sound was not heard as described, replace the
solenoid valve.
Removal and Replacement:
1. Remove all wires from the solenoid valve coil.
2. Turn off the water supply to the dispenser.
3. Disconnect the water lines to and from the solenoid
valve.
.570gpmFLOW
4. Remove the two 8-32 slotted-head screws holding
the solenoid valve and mounting bracket to the
component bracket.
sehr#26.750)
Wa
90mxoatingpsure
B
(RlpScrne3#721.)0
Saei/FwCntlor#23.750
(eRp.Flow
5. Lift out the solenoid valve.
6. Remove the two 10-32 slotted-head screws holding
the solenoid valve to its mounting bracket.
7. Securely install the new solenoid valve to its mount-
ing bracket. The direction of flow arrow must be
pointing towards the tank lid.
H 10
P1994
FIG. 15a SOLENOID VALVE
Test Procedure:
1. Disconnect the dispenser from the power source
and turn off the water supply to the dispenser.
2. Remove the pink wire from terminal 5 of the elec-
tronic control board.
8. Attach the solenoid valve and mounting bracket to
the component bracket.
9. Securely fasten the water lines to and from the
solenoid valve.
10. Reconnect the wires, FIG. 8.
3. Check the voltage across the solenoid valve coil
terminals with a voltmeter. Connect the dispenser
to the power source. The indication must be 200
to 240 volts ac for 200 to 240 volt models after a
delay of approximately 5 seconds.
WHI/BLU to Contol
Board T1
RED to Terminal Block
RED to Control Board T4
4. Disconnect the dispenser from the power source.
If voltage was present as described, proceed to #5.
If voltage was not present as described, refer to the Wir-
ing Diagrams and check the dispenser wiring harness.
P1779
5. Remove both wires from the solenoid valve coil
terminals.
FIG. 15b SOLENOID VALVE WIRING
6. Check for continuity across the solenoid valve coil
terminals.
42311 071310
15
SERVICE (cont.)
Tank Heater
Location:
The tank heater is located in the tank lid.
4. Remove the tank heater from the tank lid and in-
spect it for cracks in the sheath.
If the sheath shows no sign of damage, proceed to #5.
If the sheath is damaged, replace the tank heater.
5. Check for continuity across the tank heater termi-
nals.
If continuity is present as described, reinstall the tank
heater. The tank heater is operating properly.
If continuity is not present as described, replace the
tank heater.
Removal and Replacement:
H 5
1. Remove the wires to the tank heater.
2. Remove the 8-32 nuts from the tank heater flange.
3. Remove the tank heater.
P4093
FIG. 16a TANK HEATER
4. Inspect the tank heater gasket and replace if neces-
sary.
5. Securely install the new tank heater. Be certain of
a watertight seal.
6. Reconnect the wires, FIG. 10.
BLU to Control
Board Relay
BLK to Limit
Thermostat
H 10
P1993
FIG. 16b TANK HEATER
Test Procedure:
P1780
FIG. 16c TANK HEATER WIRING
1. Disconnect the dispenser from the power source.
2. Check the voltage across the terminals of the tank
heater with a voltmeter. Connect the dispenser to
the power source. The indication must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
HEATER
RESISTANCE
1800W-120V
4000W-240V
4000W-208V
6000W-240V
6000W-208V
07.44 - 08.67
13.43 - 15.51
10.09 - 11.99
08.85 - 10.23
06.67 - 07.70
b.) 200 to 240 volts ac for 200 to 240 volt models
or
TERMINAL TO SHEATH - INFINITE (OPEN)
c.) 230 volts ac for 230 volt models.
3. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to #4.
If voltage is not present as described, replace the tank
heater.
42311 071310
16
SERVICE (cont.)
Removal and Replacement:
Steam Sensor (Thermistor)
1. Disconnect the dispenser from the power source.
2. Disconnect the thermistor from J5 on control
board.
Location:
The thermistor is located on the end of the overflow
tube above the overflow cup.
3. Loosen the set screw and the two screws securing
the two half blocks together. Remove thermistor
assembly from overflow tube.
To test the thermistor, access will also be needed to
the electronic control board.
4. Install new thermistor on tube and slide down until
it contacts the flared end. NOTE: It’s critical that
the thermistor be centered directly under the tube
opening.
5. Snug the set screw so the block assembly does not
move aroung easily.
6. Connect the thermistor to J5 on control board.
NOTE: DO NOT TEST OPERATION WITH PANELS
REMOVED, AS AIR MOVEMENT CAN HINDER
PROPER READINGS ON THERMISTOR.
H 5X
P1993
Mounting screws
FIG. 17a LOCATION
Set screw
DO NOT BEND
THERMISTOR
UP/DOWN
H 10X
P1993
FIG. 17c STEAM SENSOR EXPLODED
FIG. 17b LOCATION
Test Procedure:
1. Disconnect the dispenser from the power source.
2. Disconnect the thermistor from J5 on control
board.
Thermistor centered
under tube opening
3. Check the resistance across thermistor with a
ohmmeter. The resistance range is approximately
9K @ room temperature to approximately 2K @
200°F.
4. Disconnect the dispenser from the power source.
If resistance was present as described, the thermistor
is working.
If resistance was not present as described, replace the
control board.
FIG. 17d THERMISTOR POSITION
42311 080510
17
SERVICE (cont.)
Dispense Valve (PC Only)
Location:
The Dispense Valve is located behind control panel.
If voltage is not present as described, refer to Wir-
ing Diagrams and check the dispenser wiring harness.
Also check the control board for proper operation.
Removal and Replacement:
1. Disconnect the dispenser from the power source
and allow to cool.
2. Drain enough water from the tank so the water level
is below the outlet.
3. Remove the nut and flare nut from the valve.
4. Remove the top cover, shroud, and bracket.
5. Disconnect wires from the valve.
6. Using a back up wrench to hold fitting in place,
Remove the valve.
Bracket
Shroud
Dispense valve
7. Wrap threads of fitting with Teflon tape and install
new valve.
8. Install bracket, nut, flare nut, wires and covers.
Nut
Flare nut
FIG. 18a DISPENSE VALVE
Test Procedures:
1. Checkthevalveforcoilaction. Turnonthevalvewith
the dispense button. Listen carefully in the vicinity
of the dispense valve for a click as the coil pulls the
plunger in.
If no sound is heard as described, proceed to #2.
If the sound is heard as described, there may be a
blockage in the valve. Disconnect the dispenser from
the power source. Remove the valve and inspect for
blockage, and de-lime all related areas.
FIG. 18b
VALVE REMOVAL
2. Connect voltmeter leads to the coil terminals. Turn
on the valve with the dispense button. NOTE: Due
to the internally rectified coil, the indication will
be 120VAC all the time. Set the meter to DC volts.
The indication should be 170VDC when activated.
If the polarity of meter leads are reversed, reading
will indicate -170VDC. (Double these readings for
240 volt coils)
REPAIR KIT
If voltage is present as described, but no coil action
is observed, valve is defective. Replace valve and test
again to verify repair.
FIG. 18c
VALVE REPAIR KIT
42311 071310
18
L1
N
L2
SCHEMATIC WIRING DIAGRAM H5E-DV PC
GRN
RED-14
BLK-14
Earth Ground
MASTER ON/OFF
SWITCH
Chassis Ground
RED-14
BLK-18
SELECTOR
SWITCH
LIMIT
THERMOSTAT
BLK-14
TANK HEATER
BRN-14
BLK-14
4000 W
TANK HEATER
WHI/VIO-14
WHT-14
WHT-18
1800 W
N.C.
OVERFLOW
PROTECTION SWITCH
REFILL
WHI/BLU-18
120VAC
120VAC
SOL
4
2
3
WHI-18
VIO-18
J7
1
WHT-18
SOL
DISPENSE
5
4
3
2
1
N.O.
COM
RELAY
MAIN
PINK-22
GRN-18
CONTROL
BOARD
J6-1
STEAM SENSOR
GRY
GRY
-
+
USED ON
H5X ONLY
J5-1
0-3.3VDC
t°
FACTORY
BLK-24
WHI-24
0-13.8VAC
-
J4-1
0-3.3VDC
+
J3-1
J1-1
USE ONLY
J3-5
J1-5
TANK
H5-PC
NO JUMPER
t°
Early H5E, H5X, H10X
Install jumper thru ver. 1.04
STATIC
SHIELD
NOTE: no jumper used on any
Model starting with ver. 1.08
120V AC 2 WIRE + GND
120/208V AC 3 WIRE + GND
120/240V AC 3 WIRE + GND
SINGLE PHASE
39333.0000D 09/09
©2006
BUNN-O-MATIC
CORPORATION
42311 071310
19
L1
BLK-14
L2
RED-14
SCHEMATIC WIRING DIAGRAM H5E-PC
GRN
Earth Ground
EMI
FILTER
Chassis Ground
BLK-18
RED-14
LIMIT
THERMOSTAT
BLK-14
LIMIT
THERMOSTAT
TANK HEATER
BLU-14
BLK-14
BLU-14
4000 W
REFILL
230VAC
N.C.
OVERFLOW
PROTECTION SWITCH
RED-18
WHI/BLU-18
SOL
SOL
4
2
3
RED-18
VIO-18
DISPENSE
230VAC
J7
1
RED-18
5
4
3
2
1
N.O.
COM
RELAY
MAIN
PINK-22
GRN-18
CONTROL
BOARD
J6-1
STEAM SENSOR
GRY
GRY
-
+
USED ON
H5X ONLY
J5-1
0-3.3VDC
t°
FACTORY
BLK-24
WHI-24
-
J4-1
0-3.3VDC
+
J3-1
J1-1
0-13.8VAC
USE ONLY
J3-5
J1-5
TANK
H5-PC
NO JUMPER
t°
Early H5E, H5X, H10X
Install jumper thru ver. 1.04
STATIC
SHIELD
NOTE: no jumper used on any
Model starting with ver. 1.08
230V AC 2 WIRE + GND
SINGLE PHASE
39333.0001C 10/09
©2006
BUNN-O-MATIC
CORPORATION
42311 071310
20
L1
BLK
L2 or N
TERMINAL BLOCK
SCHEMATIC WIRING DIAGRAM
H5-PC 200V
GRN/YEL
RED
Earth Ground
MASTER ON/OFF
SWITCH
Chassis Ground
BLU/BLK
BRN/WHI
RFI SUPPRESSION
CAPACITOR
EMI
FILTER
BRN/BLK
WHI/BLU
REFILL
LIMIT
THERMOSTAT
TANK HEATER
BLU
RED
2
4
1
3
N.C.
OVERFLOW
PROTECTION SWITCH
BLK
DISPENSE
TAN
SOL
WHI/VIO
VIO
SOL
J2
WHI/RED
4
2
3
1
BRN
BLK
5
4
3
2
1
NO COM
MAIN
CONTROL
BOARD
RELAY
PINK-22
J6-1
GRN-18
STEAM SENSOR
GRY
GRY
-
+
USED ON
H5X ONLY
J5-1
0-3.3VDC
t°
FACTORY
BLK-24
WHI-24
-
J4-1
0-3.3VDC
+
J3-1
J1-1
0-13.8VAC
USE ONLY
J3-5
J1-5
TANK
H5-PC
NO JUMPER
t°
Early H5E, H5X, H10X
Install jumper thru ver. 1.04
STATIC
SHIELD
NOTE: no jumper used on any
Model starting with ver. 1.08
200V AC 2 WIRE + GND
SINGLE PHASE
39333.0002A 12/12
©2006
BUNN-O-MATIC
CORPORATION
42311 121312
21
SCHEMATIC WIRING DIAGRAM H10X
L1
GRN
L2 or N
Earth Ground
MAIN ON/OFF SWITCH
(Late Models only)
Chassis Ground
BLK-18
BLK-14
BLK-14
TRIAC
LIMIT THERMOSTAT
BLK-14
BLK-14
BLU-14
BLU-14
TANK HEATER
TANK HEATER
TRIAC
LIMIT THERMOSTAT
BLK-14
BLK-14
OVERFLOW PROTECTION
SWITCH
RED
RED
BLK-18
4
3
1J7
2
BLU-20
TAN-20
BLU-20
TAN-20
PINK-22
5
4
3
2
1
RED-18 or WHI-18
RED-18 or WHI-18
GRN-18
N.O.
COM
WHI/BLU-18
SOL
RELAY
MAIN
CONTROL
BOARD
J6-1
STEAM SENSOR
GRY
GRY
-
+
USED ON
H5X ONLY
J5-1
0-3.3VDC
t°
FACTORY
BLK-24
WHI-24
-
J4-1
0-3.3VDC
+
GRY
J3-1
PNK
GRY
PNK
PNK
GRY
GRY
PNK
0-13.8VAC
USE ONLY
J3-5
TANK
H5-PC
NO JUMPER
t°
Early H5E, H5X, H10X
HEATER
READY
Install jumper thru ver. 1.04
REFILL
POWER
200-240 VOLTS AC
2 WIRE + GND
NOTE: no jumper used on any
Model starting with ver. 1.08
SINGLE PHASE
40707.0000C 09/09 © 2008 BUNN-O-MATIC CORPORATION
42311 071310
22
SCHEMATIC WIRING DIAGRAM H5E/H5X
L1
GRN
L2 or N
Earth Ground
MAIN ON/OFF SWITCH
(Late Models only)
Chassis Ground
BLU-14
BLK-18
BLK-14
LIMIT THERMOSTAT
BLK-14
BLK-14
TANK HEATER
OVERFLOW PROTECTION
SWITCH
RED
RED
BLK-18
BLU-20
4
3
1J7
WHI/VIO-14
2
PINK-22
5
4
3
2
1
RED-18 or WHI-18
RED-18 or WHI-18
GRN-18
N.O.
COM
WHI/BLU-18
SOL
RELAY
MAIN
CONTROL
BOARD
J6-1
STEAM SENSOR
GRY
GRY
-
+
USED ON
H5X ONLY
J5-1
0-3.3VDC
t°
FACTORY
BLK-24
WHI-24
-
J4-1
0-3.3VDC
+
GRY
J3-1
PNK
GRY
PNK
PNK
GRY
GRY
PNK
0-13.8VAC
USE ONLY
J3-5
TANK
H5-PC
NO JUMPER
t°
Early H5E, H5X, H10X
HEATER
READY
Install jumper thru ver. 1.04
100-120 VOLTS AC
or
200-240 VOLTS AC
2 WIRE + GND
SINGLE PHASE
REFILL
POWER
NOTE: no jumper used on any
Model starting with ver. 1.08
42375.0000A 09/09 © 2009 BUNN-O-MATIC CORPORATION
42311 071310
23
SCHEMATIC WIRING DIAGRAM H5XA, H5EA (CE)
L1
GRN/YEL
L2
Earth Ground
Chassis Ground
BLK-14
LIMIT THERMOSTAT
LIMIT THERMOSTAT
BLK-14 BLK-14
BLU-14
TANK HEATER
RFI SUPPRESSION
CAPACITOR
RED-18
RED-18
BLK-18
BLK-18
EMI
FILTER
OVERFLOW PROTECTION
SWITCH
RED
RED
BLK-18
4
2
3
1
BLU-14
J7
WHI/VIO-14
PINK-22
RED-18
5
4
3
2
1
MAIN
CONTROL
BOARD
N.O.
GRN-18
RED-18
WHI/BLU-18
SOL
COM
RELAY
J6-1
STEAM SENSOR
GRY
GRY
-
+
USED ON
H5X ONLY
J5-1
t°
0-3.3VDC
FACTORY
BLK-24
WHI-24
-
J4-1
+
0-3.3VDC
GRY
PNK
GRY
PNK
PNK
GRY
GRY
PNK
J3-1
USE ONLY
J3-5
0-13.8VAC
H5-PC
NO JUMPER
TANK
t°
Early H5E, H5X, H10X
HEATER
READY
Install jumper thru ver. 1.04
REFILL
POWER
NOTE: no jumper used on any
Model starting with ver. 1.08
230 VOLTS AC
2 WIRE + GND
SINGLE PHASE
40712.0000F 05/11 © 2008 BUNN-O-MATIC CORPORATION
42311 050511
24
SCHEMATIC WIRING DIAGRAM H5 ELEMENT
GRN or GRN/YEL
L1 L2 or N
Earth Ground
TERMINAL BLOCK
BLK
Chassis Ground
RED
MASTER ON/OFF
SWITCH
BLK
WHI/BLU
RED
BRN/BLK
LIMIT
THERMOSTAT
TANK HEATER
BLU
2
4
1
3
N.C.
OVERFLOW
PROTECTION SWITCH
BLK
REFILL
SOL
TAN
J2
WHI/RED
4
2
3
1
BRN
MAIN
CONTROL
BOARD
BLK
N.O.
COM
1
5
RELAY
J1
PINK
GRN/YEL
J4-1
DISPLAY
BOARD
STEAM SENSOR
GRY
GRY
-
+
USED ON
H5X ONLY
J3-1
J2-1
t°
TEMP PROBE
BLK
WHI
-
+
J1-1
J1-5
REFILL
PROBE
TANK
t°
44657.0000B 05/11 ©2011
BUNN-O-MATIC CORPORATION
100-240V AC 2 WIRE + GND
SINGLE PHASE
42311 050511
25
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