Bunn ICB TWIN SH Manuel de service

ITB/ITCB/HV

ICB/TWIN

New Infusion Series

®

SERVICE & REPAIR MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

PHONE: [phone] FAX: [phone]

54299.0000A 07/17 ©2017 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 [phone] 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

54299 031314

INTRODUCTION

This equipment will brew a half-gallon batch of coffee into an awaiting dispenser. It can be easily
configured for 120V 15 amp, 120/208V 20 amp or 120/240V 20 amp. The brewer may have a hot water
faucet for allied beverage use. It is only for indoor use on a sturdy counter or shelf.

CONTENTS

Warranty .............................................................................................................2

Contents ..............................................................................................................3

Troubleshooting ..................................................................................................4

Diagnostic Displays .............................................................................................9

Access ..............................................................................................................10

Control Board ....................................................................................................11

Membrane Switch .............................................................................................13

Bypass Valves ...................................................................................................14

Brew Valves ......................................................................................................15

Refill Valves ......................................................................................................16

Tank Heaters .....................................................................................................17

Limit Thermostat ...............................................................................................18

Temperature Probe............................................................................................19

DV Selector Switch ...........................................................................................21

On/Off Switch ....................................................................................................22

Schematic Wiring Diagrams ..............................................................................23

3

54299 070517

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 ac line voltage and some have 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 brewer is heated at all times. Keep away from combustibles.

WARNING

• Exercise extreme caution when servicing electrical equipment.

• Unplug the brewer when servicing, except when electrical tests are specified.

• Follow recommended service procedures.

• Replace all protective shields or safety notices.

Before troubleshooting this brewer, check for the following:

Control Boards

1. Make sure ribbon cable is properly attached to the control board (ALL PINS INSERTED INTO PLUG).

2. Make sure before servicing brewer that voltage is present at control board.

3. Press any warmer switch or observe if any indicator lights are glowing on the control panel. If so, proceed

with testing. If not, check for voltage across pins 9 & 11 of the 14 pin connector (black and white wires). If
voltage is present, replace the control board. If voltage is not present, check wiring and voltage across terminal
block (black and white). Correct the problem and retest before proceeding with testing.

NOTE: In the event of board replacement, technician will need to re-program customer's settings and/or recipes,

as well as re-calibrate the temperature probe in program level 2 and re-enter the serial number in level 2.

4

54299 070517

TROUBLESHOOTING (cont.)

REFILL CIRCUIT

PROBLEM

Will not refill

PROBABLE CAUSE REMEDY

1. Power off to brewer

Press ENABLE BREW switch on
control panel to determine if power
is ON.

2. Water shut off

3. Error Message

Make sure water is ON.

Brewer has shut down due to mal­function (See Diagnostic Section in
this manual).

4.ON/OFF Switch
(If equipped)

5. Lime build up on Probe(s)

Make sure ON/OFF Switch is "ON"
and indicator is lit.

Remove the Level Probe(s) and
check for lime deposit on tip. Clean
and reinstall.

6. Refill Valve or Control Board

Check valve.

Refill does not shut off
Power "ON"

Refill does not shut off
Power "OFF"

1. Lime build up on probe

2. Water Level Sensing System

3. Refill valve or control board

1. Refill valve

Remove Level Probe and check
for lime deposits on tip. Clean and
reinstall.

Replace control board

Check valve.

Clean or replace valve as needed.

5

54299 070517

TROUBLESHOOTING (cont.)

HEATING CIRCUIT

PROBLEM

Water does not heat to proper
temperature

IMPORTANT: Make sure no tem­perature tests are taken before
the display reads ready. Tank tem­perature must be stabilized before
readings are taken.

PROBABLE CAUSE REMEDY

1. Display's error message

Brewer has shut down due to mal­function. See Diagnostics.

2. Water not touching main (short)
level probe

Remove level probe and grommet.
Look into hole on tank lid. Water
must be within approximately one
inch from top of tank.

3. Water Level Probe Sensing
System

Check refill circuit. Heaters will not
turn on if water is not grounding
level probe.

4. Temperature Probe

5. Limit Thermostat or TCO

6. Tank Heater

Check/replace

Check/replace

Check/replace

Spitting or excessive steaming
(cont.)

Brewer is making unusual noises

7. Off Board Triac

1. Lime build up on temperature
probe, tank or tank heater

2. Temperature Probe

3. Control Board

1. Plumbing lines

2. Water supply

3. Lime build up

Check/replace

Inspect probe and tank assembly
for excessive lime deposits. Delime
as required.

Check/replace

Check/replace

Plumbing lines should not rest on
the counter top.

The brewer must be connected to
a cold water supply.

Remove the tank lid and clean in­side of tank with a deliming agent,
if necessary.

6

54299 070517

TROUBLESHOOTING (cont.)
BREWING CIRCUIT

PROBLEM

Brew cycle will not start

PROBABLE CAUSE REMEDY

1. Display's error message

Brewer has shut down due to mal­function. See Diagnostics.

2. No water

Water lines and valves to the brewer
must be open.

3. No power or incorrect voltage to
the brewer

4. ON/OFF switch not in the "ON"

Check for voltage across the termi­nals at the terminal block.

The indicator lamp must be lit

position

5. Low water temperature (Brew
lockout is enabled)

Allow brewer to heat until ready, or
disable the brew lockout feature.

Water must be in contact with refill

6. Water not touching refill probe

probe before brew cycle will start.

inside tank

Consistently low beverage level in
the dispenser or beverage overflows
dispenser

7. Membrane Switch

8. Dispense valve

9. Control board

1. Brew volume
NOTE: Volume adjustments must be
made with sprayhead installed.

2. Lime build up

3. Dispense Valve

Check/replace

Check/replace

Check/replace

Inspect the dispense valve and
sprayhead for excessive lime de­posits. Delime as required.

Remove dispense valve and clear
any obstructions. Rebuild or replace
valve if necessary. (See page 15)

Check/replace

7

54299 070517

TROUBLESHOOTING (cont.)

BREWING CIRCUIT (cont.)

PROBLEM PROBABLE CAUSE REMEDY

Dripping from sprayhead

Weak beverage

1. Lime build up

2. Dispense valve

1. Sprayhead

2. Water temperature

Inspect the tank assembly for ex­cessive lime deposits. Delime as
required.

Check/replace

A clean sprayhead must be used for
proper extraction.

Place an empty brew funnel on an
empty decanter beneath the spray­head. Initiate brew cycle and check
the water temperature immediately
below the sprayhead with a ther­mometer. The reading must not be
less than 195°F (91°C). Adjust the
temperature setting to increase the
water temperature. Refer to Initial
Set-up instructions.

Dry coffee grounds remain in the
funnel

3. Filter type

4. Coffee grind

5. Funnel loading

1. Sprayhead

2. Funnel loading

BUNN® paper filters must be used
for proper extraction.

A fine drip or grind must be used
for proper extraction.

The BUNN® paper filter must be
centered in the funnel and the bed
of grounds leveled by shaking
gently.

Make sure sprayhead is present and
holes are clear and unobstructed.

The BUNN® paper filter must be
centered in the funnel and the bed
of grounds leveled by shaking
gently.

Low beverage serving tempera­ture

1. Thermal server/airpot not pre­heated before brew cycle

8

Preheat server

54299 070517

DIAGNOSTICS

MESSAGE

Temperature Too Low

Heating Time Too Long

Fill Time Too Long

PROBABLE CAUSE REMEDY

1. Water temperature in the tank
does not meet the ready tempera-

A) Wait for the brewer to heat to
the proper temperature.

ture.

B) Disable the BREW LOCKOUT
function. Refer to programming
section for procedure.

1. Tank Heater failure.

2. Control Board/Thermistor fail-

Replace or repair as needed

Replace or repair as needed

ure

1. Water shut off to brewer

2. Supply line too small or ob-

Check water supply shut-off

Replace or repair as needed

structed

3. Inlet Solenoid failure

Replace or repair as needed

Temp Sensor Out Of Range, Check
For Bad Connections

Temp Sensor Out Of Range, Check
Wire For Shorts

4. Control Board Failure

5. ON/OFF switch is OFF

1. Temperature Sensor Probe
open

1. Temperature Sensor Probe
wire(s) shorted

Replace or repair as needed

Turn switch ON

Replace or repair as needed

Replace or repair as needed

9

54299 070517

COMPONENT ACCESS

This section provides procedures for testing and
replacing various major components used in this
brewer should service become necessary. Refer to
Troubleshooting for assistance in determining the
cause of any problem.

WARNING - Inspection, testing, and repair of electri­cal equipment should be performed only by qualified
service personnel. The brewer should be unplugged
when servicing, except when electrical tests are re­quired and the test procedure specifically states to
plug in the brewer.

WARNING - Disconnect the brewer from the power
source before the removal of any panel or the replace­ment of any component.

All components are accessible by the removal of
the top cover or front access panel.

Refer to wiring diagrams at the back of this
manual when reconnecting wires.

FIG. 10-2 ITB/ITCB COMPONENT ACCESS

FIG. 10-1 ICB/ITCB HV

COMPONENT ACCESS

10

FIG. 10-3 ICB/ITCB HV TWIN

COMPONENT ACCESS

54299 070517