Bunn TU3Q service manual Troubleshooting, Problem Probable Cause, Remedy

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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 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 brewer is heated at all times. Keep away from combustibles.

WARNING Ð

¥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

Problem

Probable Cause

Brew cycle will not start

1. No water

 

2. No power or incorrect voltage to

 

the brewer

 

3. External Strainer/Flow Control

 

(.750 GPM)

Remedy

Water lines and valves to the brewer must be open.

Check circuit breakers or fuses.

(A)Direction of flow arrow must be pointing towards the brewer.

(B)Remove the strainer/flow con- trol and check for obstructions. Clear or replace.

4.ON/OFF (UNSWEET/OFF/SWEET) Switch

5.Start Switch

Refer to Service - ON/OFF Switch for testing. See page 21. For OFF/ SELECTOR switch See page 25.

Refer to Service - Start Switch for testing procedures. See page 22.

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Contents Phone 217 529-6601 FAX 217 TU3QContents BUNN-O-MATIC Commercial Product WarrantyIntroduction User Notices #00831.0000 #00656.0000#03408.0002 #03409.0002 #03408.0000 #03536.0000 #03409.0000 Electrical Requirements Plumbing RequirementsElectrical Hook-Up Auto Sweetener SET-UP Initial SET-UPAuto Sweetener SET-UP Adjusting Brew VolumesCleaning Auto Sweetener CleaningOperating Controls TEA Brewing Troubleshooting Problem Probable CauseRemedy Problem TroubleshootingProbable Cause RemedyProblem Probable Cause Dripping from sprayhead Beverage overflows dispenser Brew TimerSyphon System Lime Build-up DispenserProblem Probable Cause Remedy Component Access ServiceTest Procedures Disconnect the brewer from the power source ServiceBrew Solenoid Valve Solenoid valveWiring Diagram and check the wiring harness Brew Timer Early ModelsIf voltage is as described, proceed to #7 Service Digital Brew Timer Late ModelsDigital Timer Wiring Control Thermostat Control ThermostatLimit Thermostat Limit ThermostatRefer to when reconnecting the wires Location ON/OFF SwitchSwitch terminals On the switch terminalStart Switch Start SwitchTank Heater Sweetener Solenoid Valve Optional OFF/SELECTOR Switch Volts AC 2 Wire Single Phase Schematic Wiring Diagram TU3QVolts AC Wire
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