Bunn Coffee Machine CWT no-F

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

Disconnect the blue wire from the top switch terminal and the white/red from the bottom switch terminal

Check for continuity across the two terminals on the switch when it is held in the lower position. Continuity must not be present across these terminals in the upper position

If continuity is present as described, reconnect the blue wire to the top terminal and the white/red to the bottom terminal

If continuity is not present as described, replace the switch

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

Locate the blue wire on the control thermostat

Voltage across the blue wire on the control thermostat

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

Locate the black wire on the control thermostat

Remove the capillary bulb and grommet from the tank

Voltage across the black wire of the control thermostat

If voltage is not as described, replace the thermostat

Reinstall the capillary tube into the tank to the line 4.5\ (6.0\" for Single CW models) above the bulb"

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 with a voltmeter

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

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

Remove the wires from the switch terminals

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

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

Sign off on the switch replacement