Bunn Coffee Machine CWTF-TC

Disconnect the brewer from the power source

Disconnect the black wire from the limit thermostat

Check the voltage between the black wire removed from the limit thermostat and the white wire or red wire on the tank heater with a voltmeter

Disconnect the brewer from the power source

Check the brewer wiring harness if voltage is not present as described

Check for continuity between the black wire removed from the limit thermostat and the black insert on the terminal block with the tank heater switch in the 'ON' upper position

Continuity should not be present in the 'OFF' lower position

If continuity is present as described, the tank heater switch is operating properly

If continuity is not present as described, replace the tank heater switch

Warning: Disconnect the brewer from the power source before starting the test

White or red wire removed from the upper terminal and black wire from the center terminal

Voltage across the white or red wire and the black wire

Connect the brewer to the power source

Disconnect the brewer from the power source

If voltage is not present, refer to the Wiring Diagrams and check the brewer wiring harness

Black wire removed, wire removed from the lower terminal

Warning: Disconnect the brewer from the power supply before starting the test

Voltage across the black and white wires on 120 volt models or the black and red wires for 120/240 volt models, 200 volt models and 230 volt models is as expected

If voltage is not as expected, check wiring harness

Continuity across the tank heater terminals

If continuity is not as expected, replace the tank heater

Tank heater has cracks in the sheath?

Sign off on the tank heater test

Disconnect the timer socket from the brewer wiring harness and the timer leads from the solenoid valve

Remove the one #8-32 screw securing timer to component bracket

Install new timer on component bracket securing with one #8-32 screw

Upload a photo of the reconnected wires

Readjust the timer dial as required

Sign off on the timer replacement

Warning: Disconnect the brewer from the power supply before starting the test

Brewer disconnected from the power supply

Pink and tan wires disconnected from the switch terminals

Continuity present across the two terminals on the switch when it is in the both positions

Continuity present across these terminals only in the full position

If continuity is not present as described, replace the switch