Bunn-O-Matic 391000001 User Manual
PRECISION
WATER
SERIES
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.
42311.0000J 09/16 © 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, MCR/MCP/MCA single cup 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, TRIFECTA (sylized logo), Velocity Brew, Air Brew, Beverage
Bar Creator, Beverage Profit Calculator, Brew better, not bitter., Build-A-Drink, BUNNSource, Coffee At Its Best, Cyclonic
Heating System, Daypart, Digital Brewer Control, Element, Milk Texturing Fusion, Nothing Brews Like a BUNN, Picture
Prompted Cleaning, 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.
2
42311 031314
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 (H5-PC) .............................................................................. 18
Dispense Valve (H3EA Element) .................................................................. 19
Dispense Switch (H3EA Element) ...............................................................20
Mechanical Thermostat ............................................................................... 21
Contactor ....................................................................................................22
Liquid Level Board ......................................................................................23
Schematic Wiring Diagrams ........................................................................25
3
42311 092414
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
Er1 Temperature Sensor (short)
Er2 Temperature Sensor (open)
Er3 Refill Fault (continuous refill for 15 minutes)
Er4 Heater Fault (heater relay on for 120 minutes)
Er5 Boil Thermistor (short) H5X/H10X only)
Er6 Boil Thermistor (open) H5X/H10X only)
Problem
Equipment will not operate.
Probable Cause
1. No power or incorrect voltage
When a fault occurs (failure to the unit) the POWER lamp will
flash to identify the problem (early models)
Flashes Description of Failure
1 Temperature Sensor (short)
2 Temperature Sensor (open)
3 Refill Fault (continuous refill for 15 minutes)
4 Heater Fault (heater relay on for 120 minutes)
5 Boil Thermistor (short) H5X/H10X only
6 Boil Thermistor (open) H5X/H10X only
Remedy
(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.
4
42311 071310
TROUBLESHOOTING (cont.)
Problem Probable Cause Remedy
Equipment will not operate
(cont.)
Automatic refill will not oper-
ate after drawing hot water.
2. Safety overflow switch
1. No water
2. Water strainer/flow control
3. Liquid level system
4. Solenoid valve
Refer to Service – safety overflow switch
for testing procedures.
Check plumbing and shut-off valves.
(A) Direction of flow arrow must be pointing towards dispenser.
(B) Remove the strainer/flow control and
check for obstructions. Clear or replace.
Refer to Service – electronic controls for
testing procedures.
Refer to Service – solenoid valve for testing procedures.
Water flows into the tank con-
tinuously (Dispenser discon-
1. Solenoid valve
Refer to Service – solenoid valve for testing procedures.
nected from power source).
Water flows into the tank con-
tinuously (Dispenser connect-
1. Liquid level system
Refer to Service – electronic controls for
testing procedures.
ed to power source).
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.
5
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
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 working 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.
6
42311 071310
WARNING
Very Hot Water
Use With Care!
!
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 - H3/H5E/DV-PC/X Component Access - H10X
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 - H3/5 ELEMENT: After removing
top cover, remove the two upper screws securing the
faceplate. Carefully lift faceplate straight up until the
lower screws clear the key holes.
7
42311 070615
SERVICE
H5E, H5X LIQUID LEVEL CONTROL
H5E, H5X LIQUID LEVEL CONTROL
Electronic Controls
Liquid Level Control Flow Charts
H3/5/10 LIQUID LEVEL CONTROL
PROBLEM: Does Not Refill
Triac Assy
H 5
FIG. 8a ELECTRONIC CONTROL
P4093.35
Overflow Cup Full
No
Disconnect Level Probe
Voltage present at
Solenoid Valve
?
Unplug Ready Lamp
Voltage present at
Solenoid Valve
?
No
Replace Control Board
Yes
Yes
Yes
Remove Power
Drain cup
Retry
Does Water Flow
?
Replace Solenoid Valve
Replace Ready Lamp
?
No
H3/5/10 LIQUID LEVEL CONTROL
PROBLEM: Overflows
Yes
No
Replace Probe
Electronic
Control Board
FIG. 8b ELECTRONIC CONTROL
Location:
The electronic control board is located inside the
rear of the dispenser (digital 5 gallon models). 3 & 5
gallon Elements control boards are located in the front
shroud. 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.
.750 gpm FLOW
90 psig max operating pressure
(Repl. Screen #23721.0000)
BUNN
Strainer/Flow Control # 22300.0750
(Repl. Flow Washer #20526.0750)
BOARD AND TRIAC
H 10
P1991-1.30
Drain cup
Unplug Ready Lamp
Retry
Overflow
?
Yes
Drain cup
Disconnect Probe
Wire From Probe
Short Probe Wire
To Chassis
Retry
Overflow
?
Yes
Drain cup
Disconnect Wire From
Solenoid Valve
Retry
Overflow
?
No
Replace Control Board
8
No
No
Yes
Replace Ready Lamp
Replace Probe
Replace Solenoid Valve
42311 070615
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.
Temperature Control Flow Charts
SERVICE (cont.)
H5/10X THERMOSTAT H3/5E THERMOSTAT
9
42311 070615
Electronic Controls (cont.)
H5X THERMOSTAT
H5E THERMOSTAT
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.
H5/10X THERMOSTAT H3/5E THERMOSTAT
PROBLEM: Boils Excessively - Fills Cup
Disconnect Blue Wire From
Drain cup
Retry
Red Light On While
Boiling
?
No
Control Board Pin 7
Retry
Still Boiling
?
No
Replace Control Board
Yes
Yes
Replace Steam Sensor
Still Boiling
?
No
Finished
Replace Triac Assembly
Check For Split
Tank Heater
Yes
Replace Control Assembly
10
PROBLEM: Boils
Drain cup
Retry
Red Light On While
Boiling
?
No
Disconnect Blue Wire From
Control Board Pin 7
Retry
Still Boiling
?
No
Replace Control Board
Yes
Replace Control Assembly
Yes
Replace Triac Assembly
Check For Split
Tank Heater
42311 070615
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
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
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.
T5 PNK to Liquid
Level Probe
T4 WHI or RED to
BLU to Tank
Heater
WHI/VIO to
Terminal Block
J3 PNK & GRY to
Heater Indicator
Refill Indicator
Power Indicator
Ready Indicator
Terminal Block
T3 BLK to Overflow
Safety Switch
T2 GRN or GRN/YEL
to Chassis Ground
T1 WHI/BLU to
Solenoid
J5 GRY & GRY toThermistor (H5X only)
J4 BLK & WHI to
Temperature Sensor
FIG. 11a WIRING CONNECTIONS
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.
11
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.
H 5
FIG. 12a LIMIT THERMOSTAT
H 10
FIG. 12b LIMIT THERMOSTAT
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.
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 schematic wiring diagrams when reconnecting the wires.
H 3
FIG. 12c LIMIT THERMOSTAT
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.
BLK to Terminal Block
BLK to Tank Heater
FIG. 12d LIMIT THERMOSTAT WIRING
H 3
FIG. 12e LIMIT THERMOSTAT WIRING
12
Reset
H 5/10
Reset
42311 070715
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