Bunn Coffee Machine CWTF35-APS, GF

Disconnect the water supply tube from the fill basin

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

On brewers with faucet shut-off water supply to the brewer and disconnect the inlet and outlet water lines to the faucet coil assembly

Disconnect the black wire on the limit thermostat from the tank heater switch. On late model brewers also disconnect the blue wire from the limit thermostat to the control thermostat

Disconnect the black wire and the white or red wire from the tank heater terminals

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

Remove the eight #8-32 nuts securing the tank lid to the tank

Remove the tank lid with limit thermostat, sprayhead tube, tank heater, coil assembly and control thermostat w/bracket (early models only)

Remove the two hex nuts securing the tank heater to the tank lid. Remove tank heater with gaskets and discard

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 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 start switch replacement

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

If voltage is present as described, proceed to #5

If voltage is not present as described, refer to the wiring diagrams and check the brewer wiring harness

Locate the black wire on the control thermostat

Disconnect the brewer from the power source

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

Check voltage across the white or red and white/ red, brown/black or violet with a voltmeter with the 'ON/OFF' switch in the 'ON' position

Disconnect the brewer from the power source

If voltage is present as described, proceed to #5. If voltage is not present as described, check brewer wiring harness

Check the continuity across the two terminals on the warmer element

If continuity is present as described, reconnect the white or red and white/red, and brown/black or violet wires on the warmer element. If continuity is not present as described, replace the warmer element

Sign off on the warmer element test

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