Bunn Brewer CDBCF

Warning: This maintenance check requires trained personnel with PPE!

If the control board fails the test, proceed to replace the Brewer Control Board

Disconnect the black wire and blue wire from the relay on the control board

Disconnect the 10-pin connector and the 4-pin connector from the main wiring harness

Disconnect the 11-pin connector from the control panel

Remove the four #6 screws and four nylon washers and the two #4-40 screws securing the control board to the end cap assembly

Install a new control board and secure with the four #6 screws and nylon washers and the two #4- 40 screws to the end cap assembly

NOTE: The four nylon washers must be installed under the heads of the four #6 screws to prevent a possible shorting of the control board circuits

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

Sign off on the brewer warmer elements replacement

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

Voltage across the white or red wire from the terminal block and black wire from the control board is 120 volts ac for two wire 120 volt models or 208-240 volts ac for three wire 120/208-240 volt models

Voltage across the red wire from the terminal block and black wire from the control board is 208 or 240 volts ac

Is voltage present as described?

If voltage is not present as described, check wiring harness

Disconnect the black and blue wires or the red and white/violet wires from the tank heater terminals

Continuity is present across tank heater terminals

If continuity is not present as described, replace the tank heater

Is the tank heater able to heat?

Warning: Always unplug the equipment before cleaning

Cleaned all surfaces with a damp cloth rinsed in mild, nonabrasive, liquid detergent

Checked and cleaned the sprayhead

Ensured the sprayhead holes are open

Sign off on the brewer cleaning

Remove the top cover or top warmer housing and front access panel

Disconnect the vent hose from the top of the tank

Disconnect the water supply tube to the dispense valve from the side of the tank

Disconnect the water supply tube to the solenoid valve from the bottom of the tank

On brewers with faucet, disconnect the outlet water line to the faucet from the side of the tank

Disconnect the temperature probe from the top of the tank

Disconnect the pink wire from the level probe

Disconnect the green wire from the top of the tank