Bunn DV User Manual

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.  
42311.0000B 05/11 © 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  
Electrical Schematic...............................................................................19-23  
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  
FAULT CODES  
When a fault occurs (failure to the unit) the POWER lamp will flash to identify the problem.  
Flashes  
Description of Failure  
Temperature Sensor (short)  
Temperature Sensor (open)  
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  
1
2
3
4
5
6
Probable Cause  
Remedy  
Problem  
Equipment will not operate.  
1. No power or incorrect voltage (A) Check the terminal block for the cor-  
rect voltage. It should be:  
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  
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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  
Yes  
Voltage present at  
Solenoid Valve  
?
Does Water Flow  
?
Replace Probe  
No  
No  
H 5  
Unplug Ready Lamp  
Replace Solenoid Valve  
P4093.35  
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  
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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  
Boiling  
Replace Steam Sensor  
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)  
a
90mxoatingpsure  
B
(RlpScrne3#721.)0  
Saei/FwCntlor#23.750  
(eRp.FlowW  
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  
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  
21  
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  
22  
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  
23  
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  
24  

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