Bunn Coffee Machine CWTF-35 1L, 2U

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

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

Continuity across the limit thermostat terminals checked with a ohmmeter

Sign off on the limit thermostat test

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

Voltage is 120 volts ac for two wire 120 volt models and three wire 120/240 volt models or 200 to 230 volts ac for two wire 200 volt or 230 volt models

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 when the control thermostat is turned fully clockwise

Voltage is 120 volts ac for two wire 120 volt models and three wire 120/240 volt models or 200 to 230 volts ac for two wire 200 volt or 230 volt models

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

Disconnect the polarized, three pin connector from the brewer wiring harness and rotate the brew timer dial fully counterclockwise

Check the voltage across sockets P2 & P3 (white and black wires) of the female connector when the 'ON/OFF' is in the 'ON' position

Voltage is 120 volts ac for two wire 120 volt models and three wire 120/240 volt models OR 200 to 230 volts ac on two wire 200 volt or 230 volt models

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

Check the voltage across the sockets P1 & P2 (blue and white wires) of the female connector when the 'ON/OFF' switch is in the 'ON' position (upper) and start switch pressed

Voltage is 120 volts ac for two wire 120 volt models and three wire 120/240 volt models OR 200 to 230 volts ac for two wire 200 volt or 230 volt models

If voltage is not present as described, check the brewer wiring harness

Reconnect the three pin connector from main wiring harness to the timer