Bunn Coffee Machine CWTF-APS DV

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: Always unplug the machine before cleaning

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

Check and clean the sprayhead. Ensure the sprayhead holes are open

With the sprayhead removed, insert the deliming spring (provided) all the way into the sprayhead tube. Saw back and forth five or six times

Note: In hard water areas, this may need to be done daily. It will help prevent liming problems in the brewer and takes less than a minute

Sign off on the coffee machine cleaning

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

If voltage is present as described, proceed to #5. If not, 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

If voltage is present as described, reinstall the capillary tube into the tank to the line 4.5\ (6.0\" for Single CW models) above the bulb

Sign off on the thermostat test

Remove all wires from limit thermostat terminals

Carefully slide the limit thermostat out from under the retaining clip and remove limit thermostat

Carefully slide the new limit thermostat into the retaining clip

Sign off on the thermostat replacement

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

Blue wire and white/red wire removed from the start switch

Clips inside the hood compressed and start switch pushed through the opening

New switch pushed into the opening and clips spread to hold the start switch in the hood

Wires reconnected to the new switch

Sign off on the switch replacement