Bunn Coffee Machine CWTF

Remove wires from control thermostat leads

Remove the thermostat capillary bulb by firmly pulling-up on the capillary at the tank lid

Remove the one #8-32 screw securing the control thermostat to the component bracket in the trunk

Slide the grommet to the line 4.5\ above the bulb on the new capillary tube"

Insert the capillary bulb through the hole in the tank lid and press the grommet firmly and evenly so that the groove in the grommet fits into the tank lid

Carefully bend the capillary tube so that the tube and bulb inside the tank are in the vertical position

NOTE - The capillary tube must be clear of any electrical termination and not kinked

Select the model of the coffee machine

Secure the control thermostat inside the hood (for Early Models)

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 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 or 230 volt models

If voltage is not 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

Disconnect the black wire from the limit thermostat

Check the voltage between the black wire removed from the limit thermostat and the white wire or red wire on the tank heater

Connect the brewer to the power source

Disconnect the brewer from the power source

Check the brewer wiring harness if voltage is not present as described

Check for continuity between the black wire removed from the limit thermostat and the black insert on the terminal block with the tank heater switch in the 'ON' upper position

Continuity should not be present in the 'OFF' lower position

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

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