Bunn Brewer S

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

Brewer disconnected from the power source

Blue and black wires disconnected from the limit thermostat

Ohmmeter reading across the limit thermostat terminals

Continuity present across the limit thermostat terminals

Limit thermostat operating properly

Sign off on the Brewer Limit Thermostat Test

Disconnect the brewer from the power source

Remove the WHI/RED wire from the 'A' terminal and the WHI/GRN wire from the 'B' terminal on the relay

Check for continuity across the 'A' and 'B' terminals

Reconnect the WHI/RED and WHI/GRN wires to the relay if continuity is present

Replace the relay if continuity is not present

Remove the WHI/RED wire from terminal 5 and the WHI/BLU wire from terminal 7 on the relay

Check for continuity across terminals 5 and 7 by manually closing the relay contact. Continuity must be present until contact is released

Reconnect the WHI/RED and WHI/BLU wires to the relay if continuity is present

Replace the relay if continuity is not present

Disconnect the brewer from the power source

Remove the blue wire from terminal 1 and the pink wire from terminal 4 of the circuit board

Voltage across terminals 2 and 3

Connect the brewer to the power source and turn the ON/OFF switch to the ON position

Disconnect the brewer from the power source

Reconnect the blue wire to terminal 1

Connect a piece of insulated jumper wire to terminal 4

All wires removed from the level control board

Two #8-32 screws and lockwashers removed from level control board

New level control board installed to the component bracket

Lockwashers are between the level control board and the component bracket

Wires reconnected to the new level control board

Sign off on the Brewer Liquid Level Control Board Replacement

Disconnect the brewer from the power source

Disconnect the wires from the solenoid valve. With the 'ON/OFF' switch in the 'ON' upper position press the start switch

Check the voltage across the two wires with a voltmeter. Connect the brewer to the power source.

Disconnect the brewer from the power source

If voltage is present as described, proceed to #5. 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 present as described, reconnect the wires to the solenoid. If continuity is not present as described, replace the solenoid valve

Check the solenoid valve for coil action. Connect the brewer to the power source. With 'ON/OFF' switch in the 'ON' upper position press start switch and listen carefully in the vicinity of the solenoid valve for a 'clicking' sound as the coil magnet attracts