Bunn Coffee Machine CWTF-35-APS

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

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

Black wire removed and wire from the lower terminal removed

Continuity present across the center and lower terminal with the switch in the 'ON' position

Continuity not present when the switch is in the 'OFF' position

Disconnect the brewer from the power source

Locate the blue wire on the control thermostat

Check the voltage across the blue wire on the control thermostat and the white insert on two pole 120 volt terminal block or three pole 120/ 240 volt terminal blocks and the red insert on two wire 200 volt or 240 volt terminal block with a voltmeter

Connect the brewer to the power source

Disconnect the brewer from the power source

Locate the black wire on the control thermostat

Gently remove the capillary bulb and grommet from the tank

Check the voltage across the black wire of the control thermostat and the white insert on the two pole 120 volt or three pole 120/240 volt terminal block and the red insert on the two pole 200 volt or 230 volt terminal block with a voltmeter when the control thermostat is turned fully clockwise

Connect the brewer to the power source

Remove the pink and tan wires from the switch

Compress the clips inside the hood and gently push the switch through the opening

Push new switch into the opening and spread the clips to hold the switch in the hood

Sign off on the switch replacement

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

Brewer disconnected from 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 must be present across these terminals only in the full position

Is continuity present as described?

Switch replaced if continuity is not present as described

Sign off on the selector switch test

Shut-off and disconnect the incoming water supply to the brewer

On automatic brewers gently remove the fill tube from back of fill basin

Remove the tank inlet fitting securing fill basin the tank lid. Remove fill basin and gasket. Set all three parts aside for reassembly

On brewers with faucets, disconnect the water supply to coil assembly and remove the tube from the tank to the faucet

Remove sprayhead and hex nut securing sprayhead tube to the hood. Set aside for reassembly

Disconnect the wires on the limit thermostat and the tank heater and the control thermostat (early models)

Gently pull the thermostat sensor and grommet from the tank lid

Insert a tube to the bottom of the tank and syphon ALL of the water out. (BUNN-O-MATIC has #12440 syphon assembly available for this purpose

Gently reinstall the thermostat sensor and grommet in the tank lid