Bunn Coffee Machine CW

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 holes remain open

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

Is the machine located in a hard water area?

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

Sign off on the coffee machine cleaning

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: 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

Voltage is 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

Voltage is 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

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

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 present 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

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

Remove the three #4-40 screws securing the warmer assembly to the brewer

Lift the warmer assembly from the brewer

Disconnect the two wires from the warmer element terminals

Remove the two #8-32 nuts securing the warmer element to the warmer plate

Securely install new warmer element

Reconnect the two wires to warmer element terminals

Securely install warmer assembly on the brewer