Bunn Ultra-2 HP White/Stainless, Manual Fill User manual

Ultra

®

Frozen Beverage Dispensers

Bunn-O-Matic Corporation

Post Office Box 3227, Springfield, Illinois 62708-3227

Phone (217) 529-6601 | Fax (217) 529-6644

www.bunn.com

SERVICE & REPAIR MANUAL

2

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 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 exclu-

sive 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.

BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY

3

CONTENTS

WARRANTY ..........................................................................................................................2

USER NOTICES ....................................................................................................................4

SITE PREPARATION ............................................................................................................4

INTRODUCTION ...................................................................................................................4

TEMP & TORQUE SCREEN .................................................................................................5

OPERATING CONTROLS .....................................................................................................6

USING THE DISPENSER FOR GRANITA-TYPE PRODUCTS ............................................. 7

USING THE DISPENSER FOR COLD LIQUID PRODUCTS ................................................7

RECOMMENDED CLEANING ..............................................................................................8

ASSEMBLY FOLLOWING CLEANING ..................................................................................9

AUTO-FILL CLEANING INSTRUCTIONS ............................................................................10

PREVENTIVE MAINTENANCE SCHEDULE ......................................................................11

REQUIRED REGULAR MAINTENANCE .......................................................................12,13

TROUBLESHOOTING

No power ........................................................................................................................ 14

Chills but won’t freeze ....................................................................................................15

No cooling at all .............................................................................................................16

Freezes, but not thick enough ........................................................................................17

No hood lamps ...............................................................................................................17

Noise ..............................................................................................................................18

Auger won’t turn ............................................................................................................. 18

Torque sensor error ........................................................................................................ 19

Temperature sensor error ..............................................................................................20

Clean ﬁlter messages ....................................................................................................21

SERVICE

Access Panels ................................................................................................................22

Auger Motors..................................................................................................................23

Auger Motor Capacitors .................................................................................................24

Auger Shaft Assembly ............................................................................................... 25,26

Circuit Breaker ...............................................................................................................27

Compressor

Americold .......................................................................................................28,29,30

Embraco ..................................................................................... 31,32,33,34,35,36,37

Relay (or Contactor on Early Models) ............................................................................38

Control Board .................................................................................................................39

Cooling Drum Alignment ................................................................................................40

Fan .................................................................................................................................41

Hot Gas Temperature Sensor ........................................................................................42

Lamp Cord Assembly ..................................................................................................... 43

Lamp Cord Connector .................................................................................................... 44

Lamp Holder/Socket Assembly ......................................................................................45

LED Lamps ....................................................................................................................46

Lamp Relay ....................................................................................................................47

Membrane Switch ..........................................................................................................48

Solenoids .......................................................................................................................49

Temperature Sensor ......................................................................................................50

Torque Sensor Circuit Board ..........................................................................................51

Transformer ...................................................................................................................52

Auto Fill Systems ............................................................................................53,54,55,56

Coolant Schematics .............................................................................................................57

Triac Maps ...........................................................................................................................58

Input and Output Chart ........................................................................................................59

Electrical Schematics .................................................................................................60,61,62

4

Safety First!

To avoid electrical shock, unplug dispenser from power source before servicing inside.

WARNING: When powered, the condenser cooling fan will turn on every 30 minutes to aid cooling the entire

unit, even when not in the ICE or CHILL modes. KEEP HANDS AWAY FROM FAN!

Basic Maintenance

In order to maintain proper machine operation, the shaft seals and bushings need to be replaced as a Preventive

Maintenance measure. A reminder message will appear every 6 months. Worn/dirty shaft seals/bushings will have a

direct effect on torque sensing and prevent complete freezing in “ICE” mode.

“UPPER” case vs “lower” case

Before beginning the process of troubleshooting, verify simple operating modes, ie; “CHILL” mode will not

freeze the product, but “ICE” mode will. You should also observe the letter case size in either mode. UPPER

case means the solenoid valve for that side is open, lower case, solenoid is closed.

Fault Codes

To aid in troubleshooting, fault codes are now incorporated into the display. See “Troubleshooting”.

INTRODUCTION

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Valve

Open

Valve

Closed

JAN. 25, 2019

ICE Ice

USER NOTICES

Carefully read and follow all notices on the equipment and in this manual. They were written for your

protection. All notices are to be kept in good condition. Replace any unreadable or damaged labels.

The dispenser is very heavy. Place it on a sturdy counter or shelf capable of supporting at least 180 lbs. It is

for indoor use only.

The dispenser must have at least six inches of space behind it. This space is needed for airﬂow, air ﬁlter re-

moval, and cleaning. A clearance of at approximately six inches is recommended between the dispenser sides

and the wall or another appliance. The dispenser performs better if not placed near any heating appliance.

Leave some space so the dispenser can be moved for cleaning.

This equipment contains ﬂuorinated greenhouse gases covered by the Kyoto Protocol. Hermetically sealed

system. Type R404a, 312 g (11 oz), GWP 3922, CO2 equivalent 1.22t.

This equipment contains ﬂuorinated greenhouse gases covered by the Kyto Protocal. Hermetically sealed

system. Type R452a, 312 g (11 oz), GWP 2140, CO2 equivalent 0.67t.

SITE PREPARATION

5

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30 25–

161 161˚h

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30 25–

27 28˚b

Press and hold for ﬁve seconds the left and right hidden switches to display the TEMP & TORQUE. The

temperature of each cooling drum and the hot gas temperature will toggle back and forth. The auger torque

is displayed continuously. Press and release the left and right hidden switches to return to HOME SCREEN.

The TEMP & TORQUE mode is typically used for service.

NOTICE: While in the TEMP & TORQUE screen, the UPPER/lower case will be replaced by symbols.

The indicates the solenoid valve is open, and the indicates that solenoid is closed.

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DISPLAY

TEMP & TORQUE

TEMP & TORQUE SCREEN

6

There are ﬁve of these switches that will be used for the operation of the dispenser.

1. Switch (upper left corner of the control pad)

This switch is the ON/OFF toggle switch which powers up the dispenser and the LCD display.

When ON the Date and Time toggle back and forth continously except during programming.

2. (bottom left corner)

This is used to turn the left side auger motor to AUGER ON, AUGER OFF or AUGER REFILL ON.

(Reﬁll only applicable when installed)

3. (bottom left corner)

This is used to turn the left side ice control to OFF, ICE or CHILL.

4. (bottom right corner)

This is used to turn the right side auger motor AUGER ON, AUGER OFF or AUGER REFILL ON.

(Reﬁll only applicable when installed)

5. (bottom right corner)

This is used to turn the right side ice control to OFF, ICE or CHILL.

6. Hidden buttons used for Programming.

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1

2 3 4 56

OPERATING CONTROLS

7

1. Lift the lid slightly for the selected hopper and slide back to gain access to the hopper.

2. Place the pre-mixed liquid product in the selected hopper.

3. Press and release the ON/OFF switch to power on the dispenser.

4. Press and release the appropriate (left or right side) ON/OFF switch to start the Auger Motor

and to turn on AutoFill when applicable. (See *NOTE)

5. Press and release the (OFF/ICE/CHILL) switch and select ICE to begin the cooling process for

the selected hopper.

6. Wait for the liquid to freeze to the desired consistency.

USING THE DISPENSER FOR GRANITA-TYPE PRODUCTS

*NOTE: Reﬁll system includes a “Maximum Fill Time” in the software. If the time to ﬁll the hopper

exceeds this limit, the hopper lights will ﬂash and a “Reﬁll Fault” will be displayed on the screen.

If this accurs, check the product supply to ensure the BIB is not empty. (Change BIB if empty).

Then press the “ULTRA” button for 3 seconds to clear the fault and restart the reﬁll system.

1. Lift the lid slightly for the selected hopper and slide back to gain access to the hopper.

2. Place the pre-mixed liquid product in the selected hopper.

3. Press and release the ON/OFF switch to power on the dispenser.

4. Press and release the appropriate (left or right side) ON/OFF switch to start the Auger Motor

and to turn on AutoFill when applicable. (See *NOTE)

5. Press and release the (left or right side) OFF/ICE/CHILL switch and select CHILL to begin the

cooling process for the selected hopper.

6. Wait for the liquid to cool.

USING THE DISPENSER FOR COLD LIQUID PRODUCTS

HINT: BUNN recommends that the product in the dispenser be thawed each day, usually overnight.

The ice granules get too large and a consistent product is difﬁcult to maintain if left frozen for an

extended period of time. Set the NIGHT mode for a few hours each night and return it to the DAY

mode when the product has thawed sufﬁciently. You’ll know it is in the NIGHT mode because the

display will indicate NIGHT MODE, and the hopper light(s) will turn off.

8

10. Place all parts in a clean sink with mild hot water (120°F) and sanitizer solution. Allow all parts to soak for at least 5

minutes. Carefully wash all components with a clean wash cloth in the hot water and sanitizer solution. Use a clean,

soft bristle brush as needed for the smaller components and tight areas. Do not immerse hopper lids. Use a com-

mercial sanitizer that has 100 ppm of available chlorine with a concentration level of at least 3% available chlorine

(KAY-5 Sanitizer). Follow the sanitizer’s mixing instructions to ensure 100 ppm of available chlorine.

11. Wash the drums, hopper drip trays, top covers, and outer enclosure using a clean wash cloth that has been dampened

in the hot water and sanitizer solution. Pay particular attention to the shaft area and make sure it is thoroughly cleaned

and sanitized.

12. Thoroughly rinse all surfaces with a clean wash cloth that has been dampened with hot water. Wipe dry with a clean

dry wash cloth before reassembling the dispenser.

NOTE: Although most parts are dishwasher safe, they may be affected by the chemicals in some commercial sanitizing

agents. Do not place the hopper nor hopper lids in a dishwasher. Rinse thoroughly before assembly.

2. Depress the hopper lock plunger.

Lift the hopper up slightly.

5. Remove the cooling drum seal from

the rear of the drum.

4. Pull the auger from the cooling

drum.

9. Care must be taken to ensure this surface does not get scratched during

cleaning. Deep scratches could cause leakage around the seal.

7. Carefully slide the faucet valve up

to remove the spring and faucet

seal. Extra care should be taken

when handling the seal to prevent

damage. Do not fold the seal as this

will cause damage to the Teﬂon

®

sealing surface.

6. CAUTION: The faucet valve is under

spring tension. Spread one side of

the handle ﬁrst, then the other and

disconnect from the hopper.

8. Remove the auger nose bushing

from inside the hopper.

3. Pull forward to remove.

Frequency of cleaning should be as directed by the product manufacturer.

1. Turn cooling to OFF selection. Empty all product from the hopper(s). Turn auger to OFF selection. Disconnect the hopper

lid lamp cord(s) and remove the lids. On models with autoﬁll, disconnect ﬁll hoses and level probe from hopper.

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RECOMMENDED CLEANING

9

1. Install the seal(s) over the ﬂange at

the rear of the cooling drum(s) and

press the seal(s) ﬁrmly into place

as shown. Apply a small amount of

lubicant on seal.

2. Align the auger shaft(s) with the

auger(s). Push the auger(s) as far

as they will go and rotate so the ﬂat

face of the auger shaft is aligned

with the ﬂat face of the auger nose.

4. Thoroughly rinse the hopper(s)

and install over the auger(s) and

cooling drum(s).

6. Set the lids on the hopper(s) and

plug in the hopper lid lamp cord(s).

10. Assemble the drip tray.

8. Slide the faucet valve assembly into

place on the hopper.

9. Press down on the valve to com-

press the spring. Position the faucet

handle over the faucet valve one

side at a time and snap into place

on the hopper.

7. Position the faucet seal and return

spring in the faucet valve.

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5. Slide into place and push down until

the hopper lock plunger(s) snap

into place. On models with autoﬁll,

reconnect ﬁll hoses and level probe

to hopper.

ASSEMBLY FOLLOWING CLEANING

3. Install auger nose bushing into

inside front of hopper.

11. Turn ON augers and cooling

function to desired settings.

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10

Materials required

1. Non-sudsing liquid detergent (such as common household automatic dishwasher liquid detergent).

2. Household bleach (Sodium chloride solution: 5.25%) or equivalent.

3. Clean ﬁve (5) gallon bucket.

4. Measuring Cup

5. An adaptor is needed to hold the Q.C.D. (Quick Connect/Disconnect) ﬁtting on the concentrate suction

line open. A connector from an empty bag will work.

Sanitizing Procedure

1. Fill bucket with 4 gallons of warm water (120-180 deg. F).

2. Measure 4 ounces (1/2 cup) of the liquid detergent and add to the water.

3. Measure 2 ounces (1/4 cup) of bleach and add to the water, then stir, mixing evenly.

4. Ensure that the reﬁll for the Ultra hopper is turned off.

5. Empty all product from the Ultra hopper

6. Disconnect the concentrate line from the B-I-B and install adaptor on the quick disconnect so the line is

open to the sanitizing solution. Place concentrate inlet line into the bucket so that the Q.C.D. will stay at

the bottom.

7. Press the auger button to turn on the “Auger Reﬁll On” feature.

8. Allow system to run until the hopper is about 1/4 full then turn off reﬁll.

9. Switch three way sanitize valve to the Sanitize postion.

10. Turn reﬁll system back on and let run until the hopper is almost full then turn off reﬁll.

11. Allow sanitizer to sit in system for 10 minutes.

12. Drain sanitizer from hopper and remove the Q.C.D. from the sanitizer bucket.

13. Empty remaining sanitizer and reﬁll bucket with about 2 gallons of warm (120-180 deg. F) rinse water.

14. Turn sanitize valve back to dispense position.

15. Place Q.C.D. into rinse water and turn on reﬁll system.

16. Run until hopper is about 1/4 full.

17. Turn off reﬁll system and drain hoppers.

18. Refer to the RECOMMENDED CLEANING instructions and follow these steps to clean the hopper, lid and

other dispense parts.

AUTO-FILL CLEANING INSTRUCTIONS

(WITH BRIXING PUMP INSTALLED)

11

A common problem occurs when the proper preventive maintenance procedures are not followed. Failure to

perform these procedures may result in damaged equipment and may not be covered by warranty.

Please check the following items before assuming a refrigeration fault.

When the product does not freeze, there are several possibilities other than a failure in the refrigeration system.

The torque between the auger motor and the frozen product is contolled by the torque sensor board measur-

ing the distance between the pins on the coupler and shaft. When the distance between the pins reaches the

maximum allowable distance, the compressor shuts off. The machine thinks the product thickness has reach

the maximum and shuts off the compressor. The illustration below shows some of the other possible causes

for a false reading from the torque sensor board.

Proper inspection and preventive maintenance (including daily cleaning) will avoid expensive repairs and

costly down time.

PREVENTIVE MAINTENANCE

C. TORSION SPRINGS

WEAK TORSION SPRINGS

DAMAGED/CORRODED AUGER SHAFT

DAMAGED/WORN BUSHINGS/SEALS

DIRTY OR DAMAGED TORQUE SENSOR BOARD

TOO MUCH KRYTOX GREASE

CHILL MODE

NORMAL OPERATION

POSSIBLE CAUSES FOR FALSE READINGS

ICE MODE

BENT TORQUE SENSOR PINS MISSING TORQUE SENSOR PINS

D. AUGER SHAFT

A. MOTOR SHAFT TORQUE SENSOR PIN

B. AUGER SHAFT TORQUE SENSOR PIN

E. AUGER MOTOR COUPLING

C

D

B

A

E

12

Semi-annual

BUNN Kit #34245.0000 & #34245.0001 are required

to perform the semi-annual preventive maintenance:

NOTE: Service caused by failure to perform required

maintenance is not covered by warranty.

The following instructions apply to one hopper only;

repeat each step for all hoppers.

Auger Motor Cover

Auger Motor Assy

Auger Shaft Assy

Cooling Drum

Hopper/Drum Seal

Auger Shaft Bushing

Cooling Drum

Seal

Run Capacitor

INSTRUCTIONS

WARNING - Disconnect the dispenser from the power source before the removal of any panel or the replacement

of any component.

1. Drain, remove and clean hopper; refer to the Recommended Daily Cleaning instructions for proper cleaning

procedures. Discard the hopper/drum seal and faucet seal.

2. Remove the #8 locking screws securing auger motor cover to the cooling drum mount assembly; remove

cover and set aside for reassembly.

3. Remove the #8 locking screw on the lower right side (viewed from front) of the auger motor mounting bracket

securing the auger motor run capacitor. Set capacitor aside with wires attached.

4. Disconnect the auger motor terminal from the terminal on the main wiring harness.

5. Remove the remaining #8 locking screws securing the cooling drum mounting bracket. Remove motor with

mounting bracket.

NOTE: When removing or installing motor and shaft assembies, be sure the motor and shaft pins are turned to

a position that will clear the torque sensor circuit board.

REQUIRED REGULAR MAINTENANCE

Part Number Quantity Description

• • •

26781.0000 2 3 Auger Shaft Bushing (Blue)

37593.0000 2 3 Cooling Drum Seal

32079.0000 2 3 Hopper/Drum Seal

32268.1000 2 3 Seal Kit, Faucet (Clear)

29563.0000 - - Lubricant (“Krytox”)

28395.0000 1 1 Seal Insertion Tool

Kit Contents

Inventory this kit for completeness before proceeding.

• 34245.0003 PM Kit, ULTRA-2 PAF with LEDs

• • 34245.0001 PM Kit, ULTRA-2

P1758

FIG 1

13

6. Pull the auger shaft assembly straight out of cooling drum.

Inspect the shaft for abnormal wear.

7. From the front of dispenser, remove the seal and blue bushing

from cooling drum and discard them.

8. Inspect inside of the coling drum from the rear for product

leakage and clean thoroughly with an extended bristle brush

(Bunn part no. 40500.1068) and warm sanitize solution, rinse

and dry with a towel. Clean the front seal/bushing area of the

cooling drum thoroughly with the bristle brush. Refer to Fig. 4

for areas to be cleaned.

9. Refer to FIG 1, and slip new blue bushing into cooling drum.

10. Place seal on insertion tool #28395.0000 as shown in FIG 2.

Make sure open face of seal is toward cooling drum.

11. Apply a small amount of food grade lubricant (Bunn

#M2568.1001) to inside diameter of seal. Push seal into bore

until it is ﬁrmly seated; remove tool.

12. Place a small amount of #29563.0000 “Krytox” lubricant

(provided in kit in a plastic cap) on the end of the motor shaft

(about 1

1

/

2

”) and a thin ﬁlm in the groove. Install auger shaft

assembly onto the motor shaft. See FIG 3. Do not use too much

“Krytox” lubricant. Dirt or grease on pins will cause “optical”

misreading by torque sensors.

NOTE: This is the only place “Krytox” lubricant is used.

13. Assemble motor/shaft assembly as shown in FIG 3, then install

assembly into cooling drum. Make sure the pins do not hit the

sensor board and cooling drum seal is not dislodged as the

shaft passes through.

14. Secure motor and capacitor to the cooling drum mounting

bracket. Install rear motor cover.

15. Refer to the hopper assembly and installation procedures. Install

new hopper/drum seals and faucet seals included in the kit. See

FIG 1 & 5.

16. Remove and clean condenser air ﬁlter. See FIG 6.

17. Refer to the Programming Manual, “Menu Function Index”.

Scroll to menu “PM Complete?” and answer “YES” to reset

the reminder message “PM Due”.

Lube about 1

1

/

2

” of shaft and in

the groove with #29563.0000

“Krytox” Lubricant

Seal Insertion Tool

Open face of seal

away from tool

Cooling Drum Seal

Check for weak

torsion springs

FIG 5

Faucet Seal

P1760

P3695

P3682

P1761

Auger Shaft Assy

Pins

FIG 4

Cooling Drum

Auger Shaft Bushing

Cooling Drum Seal

Hopper/Drum Seal

Inspect & Clean

REQUIRED REGULAR MAINTENANCE (continued)

FIG 2

FIG 3

FIG 6

14

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 volt ac and/or 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.

• Keep away from combustibles.

WARNING • Exercise extreme caution when servicing electrical equipment.

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

• Follow recommended service procedures

• Replace all protective shields or safety notices

No Power

Correct voltage

at outlet?

No

Yes

Call licensed

electrician for repair

12vac to Control Board

at J5-8 & J5-20?

Yes

No

Does Membrane

Switch test ok?

Yes

No

Replace Membrane

Switch

Replace Control

Board

12vac from secondary

of transformer?

No

Yes

Replace

Transformer

Check main

wiring harness

TROUBLESHOOTING

15

Chills but

won’t freeze

Dispenser in

“DAY” mode?

YesNo

Yes

No

3- Clean

1

3

2

1- Done 2- Adjust

Set into

“DAY” mode

Dispenser in

“ICE” mode?

Set into

“ICE” mode

Verify augers

are turned on

Is display showing

UPPER CASE

“ICE” mode?

Is Brix

level high?

Is Filter dirty?

Is Thickness

screen set low?

Have a certiﬁed

refrigeration technician

check for low refrigerant

or blockage.

Inspect auger drive shafts

for weak torsion springs or

damaged pins. Check for dirty

or worn seals and bushings.

TROUBLESHOOTING (continued)

16

No cooling

at all

Yes

No

Is ICE/CHILL

set to off?

Have a certiﬁed

refrigeration technician

check for low refrigerant

or blockage.

No

Set into “ICE” or

“CHILL” mode

3- Clean

1

3

1- Done 2- Adjust

1

No

Yes

Is compressor

running?

Is Dispenser on

an extension cord?

Is ﬁlter

dirty?

Plug directly

inti outlet

Call a licensed

electrician

Is there correct

voltage at outlet?

Check fan

Follow compressor

circuit checks.

TROUBLESHOOTING (continued)

17

Freezes, but not

thick enough

Adjust thickness

screen higher

Check for slightly

bent auger shaft

pins and/or weak

torsion springs.

Check for dirty

or worn seals and

bushings.

Brix ratio

too high

Too much

alcohol in

product

Ambient

temperature

too hot

Adjust

product

Recommended

for indoor

use only

No hood lamps

Is dispenser in

“DAY” mode?

No

Yes

No

Yes

Set into

“DAY” mode

Is circuit breaker

tripped?

Check lamp circuit

Verify all 4 bulbs are 912

series & reset breaker

TROUBLESHOOTING (continued)

18

Noise

Auger jumping

Check fan

Lower brix ratio

Drum alignment

Check auger shaft bushings

Using auger

assembly from

CDS 2 or 3?

Replace with ULTRA

p/n 32106.1000

Auger won’t turn

Auger motor/capacitor

checks

Check membrane

switch

Yes No

Do they turn during

“AUGER MOTOR TEST”

mode?

One direction,

but not the other

Replace control

board

TROUBLESHOOTING (continued)

19

Torque Sensor Error

Yes

No

Sensor unplugged or

break in wiring

Yes

No

TORQUE SENSOR ERROR

TORQUE SENSOR

SHORTED

TORQUE SENSOR OPEN

Are augers

turning?

Left side

Right side

Left side

Right side

Go to motor

troubleshooting

Are augers shaft pins

damaged or missing?

Check sensor

circuit

Replace as necessary

TROUBLESHOOTING (continued)

20

Temperature Sensor Error

TEMPERATURE SENSOR SHORTED

TEMPERATURE SENSOR OPEN

Left side

Right side

Check wiring harness between

thermistor and control board

Left side

Right side

Product not covering

back end of drum.

Drum temperature

falls below 9° F.

Replenish product

Thermistor unplugged

or break in wiring

Check thermistor

circuit

TROUBLESHOOTING (continued)

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Bunn Ultra-2 HP White/Stainless, Manual Fill User manual

Bunn Ultra-2 HP White/Stainless, Manual Fill User manual

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