Bunn Beverage Dispenser Dv Users Manual Service, H10X/H5X, H5E/DV PC, H5 Element Service

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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 Bunn-O-Matic website, at www.bunn.com. This is absolutely FREE, and the quickest way to obtain
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

BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY

Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:
1) Airpots, thermal carafes, decanters, GPR servers, iced tea/coffee dispensers, MCP/MCA pod brewers thermal servers
and Thermofresh servers (mechanical and digital)- 1 year parts and 1 year labor.
2) All other equipment - 2 years parts and 1 year labor plus added warranties as specified below:
a) Electronic circuit and/or control boards - parts and labor for 3 years.
b) Compressors on refrigeration equipment - 5 years parts and 1 year labor.
c) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis - parts
and labor for 4 years or 40,000 pounds of coffee, whichever comes first.
These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by it will be
commercially free of defects in material and workmanship existing at the time of manufacture and appearing within the
applicable warranty period. This warranty does not apply to any equipment, component or part that was not manufactured
by BUNN or that, in BUNN’s judgment, has been affected by misuse, neglect, alteration, improper installation or operation,
improper maintenance or repair, non periodic cleaning and descaling, equipment failures related to poor water quality,
damage or casualty. In addition, the warranty does not apply to replacement of items subject to normal use including but
not limited to user replaceable parts such as seals and gaskets. This warranty is conditioned on the Buyer 1) giving BUNN
prompt notice of any claim to be made under this warranty by telephone at (217) 529-6601 or by writing to Post Office
Box 3227, Springfield, Illinois 62708-3227; 2) if requested by BUNN, shipping the defective equipment prepaid to an
authorized BUNN service location; and 3) receiving prior authorization from BUNN that the defective equipment is under
warranty.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR ORAL, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF EITHER MERCHANTABILITY
OR FITNESS FOR A PARTICULAR PURPOSE. The agents, dealers or employees of BUNN are not authorized to make
modifications to this warranty or to make additional warranties that are binding on BUNN. Accordingly, statements by such
individuals, whether oral or written, do not constitute warranties and should not be relied upon.
If BUNN determines in its sole discretion that the equipment does not conform to the warranty, BUNN, at its exclusive option while the equipment is under warranty, shall either 1) provide at no charge replacement parts and/or labor (during the
applicable parts and labor warranty periods specified above) to repair the defective components, provided that this repair
is done by a BUNN Authorized Service Representative; or 2) shall replace the equipment or refund the purchase price for
the equipment.
THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE OF THIS
EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AT BUNN’S SOLE OPTION
AS SPECIFIED HEREIN, TO REPAIR, REPLACEMENT OR REFUND.
In no event shall BUNN be liable for any other damage or loss, including, but not limited to, lost profits, lost sales, loss of
use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute equipment, facilities
or services, or any other special, incidental or consequential damages.
392, A Partner You Can Count On, Air Infusion, AutoPOD, AXIOM, BrewLOGIC, BrewMETER, Brew Better Not Bitter, BrewWISE, BrewWIZARD, BUNN Espress, BUNN Family Gourmet, BUNN Gourmet, BUNN Pour-O-Matic, BUNN, BUNN with
the stylized red line, BUNNlink, Bunn-OMatic, Bunn-O-Matic, BUNNserve, BUNNSERVE with the stylized wrench design,
Cool Froth, DBC, Dr. Brew stylized Dr. design, Dual, Easy Pour, EasyClear, EasyGard, FlavorGard, Gourmet Ice, Gourmet
Juice, High Intensity, iMIX, Infusion Series, Intellisteam, My Café, Phase Brew, PowerLogic, Quality Beverage Equipment
Worldwide, Respect Earth, Respect Earth with the stylized leaf and coffee cherry design, Safety-Fresh, savemycoffee.com,
Scale-Pro, Silver Series, Single, Smart Funnel, Smart Hopper, SmartWAVE, Soft Heat, SplashGard, The Mark of Quality
in Beverage Equipment Worldwide, ThermoFresh, Titan, trifecta, Velocity Brew, Air Brew, Beverage Bar Creator, Beverage
Profit Calculator, Brew better, not bitter., BUNNSource, Coffee At Its Best, Cyclonic Heating System, Daypart, Digital Brewer Control, Element, Milk Texturing Fusion, Nothing Brews Like a BUNN, Pouring Profits, Signature Series, Sure Tamp, Tea
At Its Best, The Horizontal Red Line, Ultra are either trademarks or registered trademarks of Bunn-O-Matic Corporation.
The commercial trifecta® brewer housing configuration is a trademark of Bunn-O-Matic Corporation.

42311 070913

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

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 personnel.
• 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
Er1
Er2
Er3
Er4
Er5
Er6

Flashes
1
Temperature Sensor (short)
2
Temperature Sensor (open)
Refill Fault (continuous refill for 15 minutes) 3
Heater Fault (heater relay on for 120 minutes) 4
5
Boil Thermistor (short) H5X/H10X only)
6
Boil Thermistor (open) H5X/H10X only)

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

Problem

Probable Cause

Remedy

Equipment will not operate.

1. No power or incorrect voltage

(A) Check the terminal block for the correct 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

TROUBLESHOOTING (cont.)
Problem

Probable Cause

Remedy

Equipment will not operate
(cont.)

2. Safety overflow switch

Refer to Service – safety overflow switch
for testing procedures.

Automatic refill will not operate after drawing hot water.

1. No water

Check plumbing and shut-off valves.

2. Water strainer/flow control

(A) Direction of flow arrow must be pointing towards dispenser.
(B) Remove the strainer/flow control and
check for obstructions. Clear or replace.

3. Liquid level system

Refer to Service – electronic controls for
testing procedures.

4. Solenoid valve

Refer to Service – solenoid valve for testing procedures.

Water flows into the tank con- 1. Solenoid valve
tinuously (Dispenser disconnected from power source).

Refer to Service – solenoid valve for testing procedures.

Water flows into the tank con- 1. Liquid level system
tinuously (Dispenser connected to power source).

Refer to Service – electronic controls for
testing procedures.

Water is cold.

1. Safety overflow switch

Refer to Service – safety overflow switch
for testing procedures.

2. Limit thermostat

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

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. Excessive mineral build-up on stainless steel surfaces can initiate corrosive reactions resulting in serious leaks.
Dispenser is making unusual 1. Plumbing lines
noises.

Plumbing lines should not be resting on
the counter top.
(A) The dispenser must be connected to a
cold water line.

3. Water supply

(B) Water pressure to the dispenser must
not be higher than 90 psi (620 kPa). Install
a regulator if necessary to lower the working pressure to approximately 50 psi (345
kPa).
Ready indicator will not light.

1. Temperature control

Refer to Service – electronic controls for
testing procedures.

2. Ready Indicator LED

Replace the indicator LED.

42311 071310

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

G
IN
RN ter
WA Wa e!
t
!
r
Ho a
ry h C
Ve Wit
e
Us

P1770.30

The check valve, electronic control assembly, safety
overflow switch, solenoid valve, overflow tube temperature 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, overflow 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 slottedhead 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

Overflow Cup Full
?

Yes

Remove Power
Drain cup

Retry

Disconnect Level Probe

Voltage present at
Solenoid Valve
?

FIG. 8a ELECTRONIC CONTROL

Does Water Flow
?

H5
Th
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Ad thewith ment
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the is
an nis Bu
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the
ins
Of
Fo Foods Int fic Plum tal
od
er ial bin led
an Servi natios an g
d Dr ce na d Co to
Co de
ug Sa l, Inc
de of
Ad nit
mi ation. (B
OC
nis
tra Ma A)
tio nu
n (F al
DA
).

Yes

Replace Probe

Unplug Ready Lamp

Replace Solenoid Valve

P4093.35
Voltage present at
Solenoid Valve
?

Yes

Replace Ready Lamp

No
Replace Control Board

Triac Assy
H5E, H5X LIQUID LEVEL CONTROL
PROBLEM: Overflows
Drain cup
Unplug Ready Lamp

Electronic
Control Board
BUNN

.750 gpm FLOW
90 psig max operating pressure
Strainer/Flow Control # 22300.0750
(Repl. Flow Washer #20526.0750)
(Repl. Screen #23721.0000)

Retry

Overflow
?

Replace Ready Lamp

Yes

H 10

Drain cup

P1991-1.30

FIG. 8b ELECTRONIC CONTROL
BOARD AND TRIAC

Disconnect Probe
Wire From Probe
Short Probe Wire
To Chassis
Retry

Location:
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.
General:
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.
8

Overflow
?

Replace Probe

Yes
Drain cup
Disconnect Wire From
Solenoid Valve
Retry

Overflow
?

Yes

Replace Solenoid Valve

No
Replace Control Board

42311 071310

SERVICE (cont.)
Electronic Controls (cont.)
Liquid Level Control Test Procedure
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 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. 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.

4. Remove the pink wire from terminal 5 of the electronic 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:
a.) 100 to 120 volts ac for 100 to 120 voltmodels
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.
If voltage was present as described, the liquid level control 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

Electronic Controls (cont.)
7. Reconnect the pink wire to terminal 5 of the electronic control assembly.
8. Loosen the compression fitting, remove the probe
from the tank lid, and inspect it for mineral deposits. 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 electronic control assembly 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.
10. Touch the screw head end of the probe to the dispenser 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.

If voltage was not present as described, check the pink
probe wire and the green ground wire for continuity
and/or replace the probe.
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
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.

Temperature Control Flow Charts (cont.)
If voltage was present as described, reinstall the probe,
the sensing function of the system is operating properly.
H5X THERMOSTAT

H5E THERMOSTAT

PROBLEM: Boils Excessively - Fills Cup

PROBLEM: Boils

Drain cup

Retry

Red Light On While
Boiling
?

Yes

Red Light On While
Boiling
?

Replace Steam Sensor

Yes

Replace Control Assembly

No
Disconnect Blue Wire From
Control Board Pin 7

Still Boiling
?

Retry

Yes

Replace Control Assembly

Disconnect Blue Wire From
Control Board Pin 7
Retry

No
Finished
Still Boiling
?
No

Still Boiling
?

Yes
Replace Triac Assembly
Check For Split
Tank Heater

Replace Control Board

42311 071310

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.
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
b.) 200 to 240 volts ac for 200 to 240 volt models
or
c.) 230 volts ac for 230 volt models

T5 PNK to Liquid
Level Probe
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

T1 WHI/BLU to
Solenoid
J5 GRY & GRY toThermistor (H5X only)

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.
Electronic Controls Removal and Replacement

J4 BLK & WHI to
Temperature Sensor

J3 PNK & GRY to
Heater Indicator
Refill Indicator
Power Indicator
Ready Indicator

FIG. 11a WIRING CONNECTIONS

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.
6. Refer to Fig 2 when reconnecting the wires.
7. Review the initial set-up procedures on page 6.

Adjustments
The H5X/H10X dispensers hold the water temperature 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 immediately below the faucet as it flows from the
dispenser with an accurate thermometer. Do not
take the temperature of water collected in a container.
3. If any adjustment is required, refer to LEVEL 1
PROGRAMMING in the Operating Manual.

42311 071310

SERVICE (cont.)
Limit Thermostat
Location:
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.

If voltage was present as described, reconnect the black
wire and proceed to #5.
If voltage was not present as described, refer to the Wiring Diagrams and check the dispenser wiring harness.
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.

H5
P4093

FIG. 12a LIMIT THERMOSTAT

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Adm thewith en
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H 10

Removal and Replacement:
1. Remove both wires from the limit thermostat terminals.
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.

BLK to Terminal Block

Reset

P1993

FIG. 12b LIMIT THERMOSTAT

BLK to Tank Heater

Test Procedure:
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. Remove the black wire at the limit thermostat coming
from the terminal block.
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.
12

P1776

FIG. 12c LIMIT THERMOSTAT WIRING

42311 071310

SERVICE (cont.)

Removal and Replacement:
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.

Safety Overflow Switch

H5
P4093

FIG. 13a SAFETY OVERFLOW SWITCH

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.
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

FIG. 13b OVERFLOW PROTECTION SWITCH
Location:
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 mounting bracket.

RED to BLK Wire from Electronic Control #3
P1777

FIG. 13c SAFETY OVERFLOW WIRING

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.
13

42311 071310

SERVICE (cont.)
Solenoid Valve (Late Models)
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
to the electronic control board.

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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 electronic 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.

OR WA

RR MA

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CE
NU
0083 EC
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INGANTY AL
1.00
D TO HE
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5/88
IS
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©
PR D
1988 PO
OD
WE WH
BUN
UC
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COR
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POR
ATIO
N

P1778

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 electronic control board.
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 Wiring Diagrams and check the dispenser wiring harness.

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.
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.
WHI/BLU to Electronic
Control Board T1
WHI or RED to
Terminal Block

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)
Location:
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.

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”
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 electronic control board.

BUNN

.750 gpm FLOW
90 psig max operating pressure
Strainer/Flow Control # 22300.0750
(Repl. Flow Washer #20526.0750)
(Repl. Screen #23721.0000)

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.

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 electronic control board.
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.
4. Disconnect the dispenser from the power source.

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.
4. Remove the two 8-32 slotted-head screws holding
the solenoid valve and mounting bracket to the
component bracket.
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 mounting bracket. The direction of flow arrow must be
pointing towards the tank lid.
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.

WHI/BLU to Contol
Board T1
RED to Terminal Block
RED to Control Board T4

If voltage was present as described, proceed to #5.
If voltage was not present as described, refer to the Wiring Diagrams and check the dispenser wiring harness.
5. Remove both wires from the solenoid valve coil
terminals.
6. Check for continuity across the solenoid valve coil
terminals.
15

P1779

FIG. 15b SOLENOID VALVE WIRING
42311 071310

SERVICE (cont.)
Tank Heater
Location:
The tank heater is located in the tank lid.

4. Remove the tank heater from the tank lid and inspect 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 terminals.

FIG. 16a TANK HEATER

P4093

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:
1. Remove the wires to the tank heater.
2. Remove the 8-32 nuts from the tank heater flange.
3. Remove the tank heater.
4. Inspect the tank heater gasket and replace if necessary.
5. Securely install the new tank heater. Be certain of
a watertight seal.
6. Reconnect the wires, FIG. 10.

BLU to Control
Board Relay

H 10

FIG. 16b TANK HEATER

BLK to Limit
Thermostat

P1993
P1780

FIG. 16c TANK HEATER WIRING
Test Procedure:
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
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.

HEATER
RESISTANCE
1800W-120V
07.44 - 08.67
4000W-240V
13.43 - 15.51
4000W-208V
10.09 - 11.99
6000W-240V
08.85 - 10.23
6000W-208V
06.67 - 07.70
TERMINAL TO SHEATH - INFINITE (OPEN)

If voltage is present as described, proceed to #4.
If voltage is not present as described, replace the tank
heater.
16

42311 071310

SERVICE (cont.)
Steam Sensor (Thermistor)
Location:
The thermistor is located on the end of the overflow
tube above the overflow cup.
To test the thermistor, access will also be needed to
the electronic control board.

Removal and Replacement:
1. Disconnect the dispenser from the power source.
2. Disconnect the thermistor from J5 on control
board.
3. Loosen the set screw and the two screws securing
the two half blocks together. Remove thermistor
assembly from overflow tube.
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

H 10X
P1993

DO NOT BEND
THERMISTOR
UP/DOWN

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.
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.

Thermistor centered
under tube opening

FIG. 17d THERMISTOR POSITION
42311 080510

SERVICE (cont.)
Dispense Valve (PC Only)
Location:
The Dispense Valve is located behind control panel.

Bracket
Shroud
Dispense valve

If voltage is not present as described, refer to Wiring 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.
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. Check the valve for coil action. Turn on the valve with
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.
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)
If voltage is present as described, but no coil action
is observed, valve is defective. Replace valve and test
again to verify repair.
18

FIG. 18b
VALVE REMOVAL

REPAIR KIT

FIG. 18c
VALVE REPAIR KIT

42311 071310

SCHEMATIC WIRING DIAGRAM H5E-DV PC

L1 N L2
GRN

RED-14

BLK-14
Earth Ground
MASTER ON/OFF
SWITCH

Chassis Ground

RED-14

BLK-18

SELECTOR
SWITCH

N.C.
OVERFLOW
PROTECTION SWITCH

BRN-14

4000 W

BLK-18

WHI/BLU-18

WHI-18

J7
1

VIO-18

CONTROL

120VAC

SOL

120VAC

SOL

REFILL

WHT-18

WHT-18
DISPENSE

5
4
3
2
1

COM

MAIN

TANK HEATER WHT-14
1800 W

N.O.

RELAY

PINK-22

J6-1

GRN-18

BOARD
J2

FACTORY

TANK HEATER

WHI/VIO-14

BLU-14

LIMIT
THERMOSTAT
BLK-14
BLK-14

+
0-3.3VDC J4-1 +
0-3.3VDC

J5-1

J1-1

J3-5

J1-5

t°

USED ON
H5X ONLY

BLK-24
WHI-24
0-13.8VAC

J3-1

STEAM SENSOR

GRY
GRY

USE ONLY

Heater

MEMBRANE SWITCH ASSY

Ready

White Strip-Tac Plus

Manual Dispense/Stop

Power

120V AC 2 WIRE + GND
120/208V AC 3 WIRE + GND
120/240V AC 3 WIRE + GND
SINGLE PHASE

Left Dispense
Middle Dispense

NOTE: no jumper used on any
Model starting with ver. 1.08

TANK

Right Dispense

Early H5E, H5X, H10X
Install jumper thru ver. 1.04

“Hidden” Switch

H5-PC
NO JUMPER

t°

STATIC
SHIELD

39333.0000D 09/09
©2006
BUNN-O-MATIC
CORPORATION

42311 071310

L1
GRN
Earth Ground

Chassis Ground

SCHEMATIC WIRING DIAGRAM H5E-PC

L2
RED-14

BLK-14
EMI
FILTER

BLK-18
RED-14

LIMIT
THERMOSTAT
BLK-14
BLK-14

TANK HEATER BLU-14
4000 W

BLU-14

N.C.
OVERFLOW
PROTECTION SWITCH
BLK-18

RED-18

J7
1

VIO-18

COM

MAIN
CONTROL

RED-18

DISPENSE
230VAC
SOL

RED-18

5
4
3
2
1

N.O.

RELAY

PINK-22

J6-1

GRN-18

BOARD
J2

FACTORY

REFILL
230VAC
SOL

WHI/BLU-18

LIMIT
THERMOSTAT

+
0-3.3VDC J4-1 +
0-3.3VDC

J5-1

J1-1

J3-5

J1-5

t°

USED ON
H5X ONLY

BLK-24
WHI-24
0-13.8VAC

J3-1

STEAM SENSOR

GRY
GRY

USE ONLY

MEMBRANE SWITCH ASSY

Heater

White Strip-Tac Plus

Ready

Manual Dispense/Stop

230V AC 2 WIRE + GND
SINGLE PHASE

Power

Left Dispense
Middle Dispense

NOTE: no jumper used on any
Model starting with ver. 1.08

TANK

Right Dispense

Early H5E, H5X, H10X
Install jumper thru ver. 1.04

“Hidden” Switch

H5-PC
NO JUMPER

t°

STATIC
SHIELD

39333.0001C 10/09
©2006
BUNN-O-MATIC
CORPORATION

42311 071310

SCHEMATIC WIRING DIAGRAM
H5-PC 200V

L1
GRN/YEL

L2 or N
TERMINAL BLOCK

BLK

RED
MASTER ON/OFF
SWITCH

Earth Ground
Chassis Ground

BLU/BLK

BRN/WHI

RFI SUPPRESSION
CAPACITOR

EMI
FILTER
BRN/BLK
TANK HEATER

BRN/WHI

N.C.
OVERFLOW
PROTECTION SWITCH

BLU

BLK

4
2

MAIN
CONTROL
BOARD

DISPENSE

REFILL
WHI/VIO

SOL

VIO

SOL

WHI/RED

3
1

BRN

5
4
3
2
1

COM

RELAY
PINK-22

J6-1

GRN-18

0-3.3VDC
+
0-3.3VDC J4-1 +
J5-1

1
5

USE ONLY

RED

TAN

BLK

FACTORY

WHI/BLU

LIMIT
THERMOSTAT

J3-1

J1-1

J3-5

J1-5

STEAM SENSOR

GRY
GRY

t°

USED ON
H5X ONLY

BLK-24
WHI-24
0-13.8VAC

MEMBRANE SWITCH ASSY

Heater

White Strip-Tac Plus

Ready

Power

200V AC 2 WIRE + GND
SINGLE PHASE

Manual Dispense/Stop

Left Dispense
Middle Dispense

NOTE: no jumper used on any
Model starting with ver. 1.08

TANK

Right Dispense

Early H5E, H5X, H10X
Install jumper thru ver. 1.04

“Hidden” Switch

H5-PC
NO JUMPER

t°

STATIC
SHIELD

39333.0002A 12/12
©2006
BUNN-O-MATIC
CORPORATION

42311 121312

SCHEMATIC WIRING DIAGRAM H10X
L1

GRN

L2 or N

Earth Ground
MAIN ON/OFF SWITCH
(Late Models only)
Chassis Ground

BLK-18
WHI/VIO-14

BLK-14
BLK-14
TRIAC
LIMIT THERMOSTAT
BLK-14
BLK-14

WHI/VIO-14

BLU-14
TANK HEATER
TRIAC

LIMIT THERMOSTAT
BLK-14
BLK-14

RED or WHI-18

BLU-14

TANK HEATER
OVERFLOW PROTECTION
SWITCH
RED
RED
BLK-18

BLU-20
TAN-20
BLU-20

BLU-18

BRN/BLK-18

TAN-20

N.O.
COM

MAIN
CONTROL

PINK-22

5
4
3
2
1

RELAY

RED-18 or WHI-18
RED-18 or WHI-18
GRN-18
WHI/BLU-18

J6-1

BOARD
J2

FACTORY

+
0-3.3VDC J4-1 +
0-3.3VDC

J5-1

J3-1

J1-1

J3-5

J1-5

USE ONLY

SOL

STEAM SENSOR

GRY
GRY

t°

USED ON
H5X ONLY

WHI-24

GRY
PNK
GRY
PNK
PNK
GRY
GRY
PNK

0-13.8VAC

TANK

H5-PC
NO JUMPER

Early H5E, H5X, H10X
Install jumper thru ver. 1.04
NOTE: no jumper used on any
Model starting with ver. 1.08

BLK-24

HEATER

REFILL

t°

READY

POWER

White Strip-Tac Plus
Black Ink
22
Finished Size: 5.5” x 8.0”
~ No Reduction

200-240 VOLTS AC
2 WIRE + GND
SINGLE PHASE

42311 071310

SCHEMATIC WIRING DIAGRAM H5E/H5X
L1

GRN

L2 or N

Earth Ground
MAIN ON/OFF SWITCH
(Late Models only)
Chassis Ground

BLK-18

LIMIT THERMOSTAT
BLK-14
BLK-14

RED or WHI-18

BLK-14

BLU-14
TANK HEATER

OVERFLOW PROTECTION
SWITCH
RED
RED
BLK-18

BLU-20
3

WHI/VIO-14

BLU-18

N.O.
COM

MAIN
CONTROL

PINK-22

5
4
3
2
1

RELAY

RED-18 or WHI-18
RED-18 or WHI-18
GRN-18
WHI/BLU-18

J6-1

BOARD
J2

FACTORY

+
0-3.3VDC J4-1 +
0-3.3VDC

J5-1

J3-1

J1-1

J3-5

J1-5

STEAM SENSOR

GRY
GRY

t°

USED ON
H5X ONLY

0-13.8VAC

TANK

H5-PC
NO JUMPER

Early H5E, H5X, H10X
Install jumper thru ver. 1.04

HEATER

NOTE: no jumper used on any
Model starting with ver. 1.08

REFILL

t°

READY

POWER

BLK-24
WHI-24

GRY
PNK
GRY
PNK
PNK
GRY
GRY
PNK

USE ONLY

SOL

100-120 VOLTS AC
or
200-240 VOLTS AC
2 WIRE + GND
SINGLE PHASE

42311 071310

SCHEMATIC WIRING DIAGRAM H5XA, H5EA (CE)
GRN/YEL

Earth Ground
Chassis Ground
BLK-14

LIMIT THERMOSTAT
BLK-14
BLK-14

BLU-14

LIMIT THERMOSTAT

TANK HEATER
RFI SUPPRESSION
CAPACITOR

BLK-18

RED-18

EMI
FILTER

BLK-18
OVERFLOW PROTECTION
SWITCH

RED

BLK-18

BLU-14

WHI/VIO-14

MAIN
CONTROL
BOARD

RED-18

PINK-22

5
4
3
2
1

N.O.
COM

RED-18
GRN-18
WHI/BLU-18

SOL

RED-18

RELAY
J6-1

FACTORY

USE ONLY

0-3.3VDC
0-3.3VDC

J5-1
J4-1

J3-1

J1-1

J3-5

J1-5

STEAM SENSOR

GRY
GRY

+
+

t°

USED ON
H5X ONLY

WHI-24

GRY
PNK
GRY
PNK
PNK
GRY
GRY
PNK

0-13.8VAC

H5-PC
NO JUMPER

Early H5E, H5X, H10X
Install jumper thru ver. 1.04

TANK
HEATER

REFILL

NOTE: no jumper used on any
Model starting with ver. 1.08

BLK-24

t°

READY

POWER

230 VOLTS AC
2 WIRE + GND
SINGLE PHASE
42311 050511

GRN or GRN/YEL

SCHEMATIC WIRING DIAGRAM H5 ELEMENT

L1 L2 or N

Earth Ground
TERMINAL BLOCK

BLK

Chassis Ground

RED
MASTER ON/OFF
SWITCH

BLK

WHI/BLU

BRN/BLK

RED

TANK HEATER

BRN/WHI

N.C.
OVERFLOW
PROTECTION SWITCH

LIMIT
THERMOSTAT
BLU

BLK

REFILL
TAN

4
2

SOL
WHI/RED

3
1
BRN

MAIN
CONTROL

BLK

BOARD
J1

N.O.
COM

RELAY

DISPLAY

BOARD

PINK
GRN/YEL

J4-1

GRY
GRY

J2-1 +-

BLK

J3-1

STEAM SENSOR
t°

USED ON
H5X ONLY
TEMP PROBE

WHI

J1-1
J1-5

REFILL
PROBE

TANK

t°

100-240V AC 2 WIRE + GND
SINGLE PHASE

White Strip-Tac Plus
Black Ink
Finished Size: 5.5” x 8.0”
~ No Reduction

42311 050511

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Creator Tool                    : Adobe InDesign CS6 (Macintosh)
Format                          : application/pdf
Title                           : service, H10X/H5X, H5E/DV PC, H5 Element Service Manual
Description                     : Service Manual for the H10X/H5X, H5E/DV PC, H5 Element Hot Water Dispensers.
Subject                         : H10X, H5X, H5E/DV PC, H5 Element, Service Manual
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EXIF Metadata provided by EXIF.tools

Bunn Beverage Dispenser Dv Users Manual Service, H10X/H5X, H5E/DV PC, H5 Element Service

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