Bunn Hot Water Dispencer 43600.0028

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

Disconnected the dispenser from the power source

Remove the black wire at the limit thermostat coming from the terminal block

Black wire removed from the limit thermostat

Voltage across the black wire and the white or red wire of the terminal block

If voltage was not present as described, check the dispenser wiring harness

Voltage was present as described

Reconnect the black wire and proceed to next step if voltage was present as described

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

Disconnect the black wire from the contactor coil to the limit thermostat and black wire from the red wire on the main harness on two wire 240V models

Voltage across the red wire and black wire

If voltage is not as described, check the wiring harness

Check for continuity between the left and right terminals on the contactor coil

If continuity is not as described, replace the contactor

Voltage across the upper left terminal and the upper right terminal on the contactor

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

Voltage across the black wire on the thermostat and the white or red wire at the terminal block

If voltage is not as described, refer to the Wiring Schematics and check the dispenser wiring harness

Voltage across the blue/black wire on the thermostat and the white or red wire at the terminal block when the thermostat is turned ON

Voltage must not be indicated when the thermostat is turned OFF

If voltage is not as described, replace the thermostat

Sign off on the thermostat test

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

Voltage across terminals 3 & 4 of the electronic control circuit board

Voltage across the tank heater terminals

Was voltage present as described?

If voltage was not present as described, contact Bunn-O-Matic to order an electronic control board and temperature sensor for evaluation and proceed to #9

Upload a photo of the new electronic control board

Voltage across the tank heater terminals after replacing the electronic control board

Check the valve for coil action

Describe the sound heard from the dispense valve

Is there a blockage in the valve?

Voltage reading from the coil terminals

Is the voltage present as described?

Is the dispenser wiring harness functioning properly?

Is the control board functioning properly?

Replace the Dispense Valve (PC & H3 Element Only)

Is the dispenser disconnected from the power source and allowed to cool?