Bunn Coffee Machine CWTF-15-1L/2U

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

Disconnect the pink and tan wires from the switch terminals

Check for continuity 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

If continuity is not present as described, replace the switch

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

Is the voltage 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

Is the voltage 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

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 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)

Disconnect the brewer from the power source

Remove the white or red wire from the upper terminal and the black wire from the center terminal

Check the voltage across the white wire or red wire and the black wire with a voltmeter

Disconnect the brewer from the power source

If voltage is present as described, reconnect the white or red wire

With the black wire removed, remove the wire from the lower terminal

Check for continuity across the center and lower terminal with the switch in the 'ON' position

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