Bunn Coffee Machine CWTF-DV-3

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: Always unplug the machine before cleaning

Cleaned all surfaces with a damp cloth rinsed in mild, non-abrasive, liquid detergent

Checked and cleaned the sprayhead, ensuring the sprayhead holes remain open

Inserted the deliming spring (provided) all the way into the sprayhead tube, sawing back and forth five or six times

Note: In hard water areas, step 4 may need to be done daily

Sign off on the coffee machine cleaning

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

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

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

White or red wire removed from the upper terminal and black wire from the center terminal

Voltage across the white or red wire and the black wire

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

Black wire removed and wire from the lower terminal removed

Continuity present across the center and lower terminal with the switch in the 'ON' position

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