Bunn TU3Q service manual Troubleshooting, Problem, Probable Cause, Remedy

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TROUBLESHOOTING (cont.)

PROBLEM

Brew cycle will not start (cont.)

PROBABLE CAUSE

6.Brew Timer

7.Brew Solenoid Valve

REMEDY

Refer to Service - Brew Timer for testing procedures. See page 16 or 17.

Refer to Service - Brew Solenoid Valve for testing procedures. See page 15.

Water is not hot

1. Limit Thermostat

Refer to Service - Limit Thermostat

CAUTION - Do not eliminate or by-

for testing procedures. See page

pass limit thermostat or thermal

20.

cut-off. Use only BOM replacement

 

part #29329.1000

 

2. Control Thermostat

Refer to Service - Control Thermo-

 

stat for testing procedures. See

 

page 19.

Dilution cycle will not start

Inconsistent beverage level in dispenser

3. Tank Heater

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

2.Start Switch

1.Syphon System

2.Lime Build-up

CAUTION - Tank and tank compo- nents should be delimed regularly depending on local water condi- tions. Excessive mineral build-up on stainless steel surfaces can ini- tiate corrosive reactions resulting in serious leaks.

Refer to Service - Tank Heater for testing procedures. See page 23.

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.

The brewer must be level or slightly lower in front to syphon properly.

Inspect the tank assembly for ex- cessive lime deposits. Delime as required.

3. Water Pressure

The water pressure to the brewer

 

must be at least 20 psi (138 kPa).

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Contents TU3Q Phone 217 529-6601 FAX 217BUNN-O-MATIC Commercial Product Warranty ContentsIntroduction #00831.0000 #00656.0000 User Notices#03408.0002 #03409.0002 #03408.0000 #03536.0000 #03409.0000 Plumbing Requirements Electrical RequirementsElectrical Hook-Up Initial SET-UP Auto Sweetener SET-UPAdjusting Brew Volumes Auto Sweetener SET-UPAuto Sweetener Cleaning CleaningOperating Controls TEA Brewing Problem Probable Cause TroubleshootingRemedy Probable Cause TroubleshootingProblem RemedyProblem Probable Cause Syphon System Lime Build-up Beverage overflows dispenser Brew TimerDripping from sprayhead DispenserProblem Probable Cause Remedy Service Component AccessBrew Solenoid Valve ServiceTest Procedures Disconnect the brewer from the power source Solenoid valveBrew Timer Early Models Wiring Diagram and check the wiring harnessService Digital Brew Timer Late Models If voltage is as described, proceed to #7Digital Timer Wiring Control Thermostat Control ThermostatLimit Thermostat Limit ThermostatSwitch terminals ON/OFF SwitchRefer to when reconnecting the wires Location On the switch terminalStart Switch Start SwitchTank Heater Sweetener Solenoid Valve Optional OFF/SELECTOR Switch Schematic Wiring Diagram TU3Q Volts AC 2 Wire Single PhaseWire Volts AC