Bunn Coffee Machine CWTF APS

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 checked

If voltage is not present as described, check wiring harness

Black wire and the white or red wire disconnected from the tank heater terminals

Continuity across the tank heater terminals checked

Continuity present as described

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

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

Brewer disconnected from the power source

Blue and black wires disconnected from the limit thermostat

Ohmmeter reading for continuity across the limit thermostat terminals

Sign off on the limit thermostat test

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

Disconnect the white/blue and white/green wires from the solenoid valve

Press the start switch with the 'ON/OFF' switch in the 'ON' upper position

Voltage across the white/blue and white/green wires

Voltage is present as described

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

Check for continuity across the solenoid valve coil terminals

Continuity is present as described

If continuity is not present as described, replace the Solenoid Valve

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

White or red wire connected to the terminal block and the white/red, brown/black or violet wire connected to the 'ON/OFF' switch?

Voltage across the white or red and white/ red, brown/black or violet with the 'ON/OFF' switch in the 'ON' position

If voltage is not as described, check brewer wiring harness

Continuity present across the two terminals on the warmer element?

If continuity is not present as described, replace the warmer element

Sign off on the warmer element test

Warning: Ensure the coffee machine is unplugged before starting the procedure

Blue wire and white/red wire removed from the start switch

Clips inside the hood compressed and start switch gently pushed through the opening

New switch pushed into the opening and clips spread to hold the start switch in the hood

Wires reconnected to the new switch

Sign off on the switch replacement