Bunn Coffee Machine CW15

Warning: This procedure requires trained personnel with PPE!

Remove the #8-32 screw securing circuit board to the mounting bracket

Remove circuit board and spacers (as required)

Remove all wires from the timer

Attach all wires to the replacement timer board prior to installation to the component mounting bracket. Refer to FIG. 21 when reconnecting the wires

Install new circuit board with spacers (as required) to the component mounting bracket

Adjust the timer as described below

Sign off on the timer replacement

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

Wires reconnected to the new limit thermostat

Sign off on the thermostat 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: 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

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

Check for continuity across the solenoid valve coil terminals

If continuity is not present as described, replace the Solenoid Valve

Check the solenoid valve for coil action

Listen carefully in the vicinity of the solenoid valve for a clicking sound

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

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