Bunn Coffee Machine CWTF 20 APS

Warning: Ensure the coffee machine is unplugged before starting the procedure

Remove the pink and tan wires from the switch

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

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

Sign off on the switch replacement

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

All wires removed from limit thermostat terminals

Limit thermostat slid out from under the retaining clip and removed

New limit thermostat slid into the retaining clip

Sign off on the thermostat replacement

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 supply before starting the test

Brewer disconnected from the power supply

Pink and tan wires disconnected from the switch terminals

Continuity checked across the two terminals on the switch when it is in the both positions

Continuity present across these terminals only in the full position

If continuity is not present as described, was the switch replaced?