Bunn Hot Water Dispencer H5E-18-120

Remove all wires from the electronic control board terminals

Remove the six 6-32 screws holding the electronic control board to the component bracket

Disconnect the temperature sensor, overflow tube temperature sensor, and indicator wires from the electronic control board

Attach the temperature sensor, overflow tube temperature sensor, and indicator wires to the electronic control assembly

Fasten the new electronic control board to its bracket

Upload a photo of the reconnected wires

Review the initial set-up procedures on page 6

Sign off on the electronic control replacement

Disconnect the dispenser from the power source

Voltage across terminals 3 & 4 of the electronic control board

Check the dispenser wiring harness if voltage was not present as described

Remove the pink wire from terminal 5 of the electronic control assembly

Voltage across terminals 1 & 4 of the electronic control board

Disconnect the dispenser from the power source

Replace the electronic control board and the temperature sensor in the tank lid if voltage was not present as described

Reconnect the pink wire to terminal 5 of the electronic control assembly

Loosen the compression fitting, remove the probe from the tank lid, and inspect it for mineral deposits. Replace it if necessary. Keep the exposed ends of the probe away from any metal surface of the dispenser

Disconnect the dispenser from the power source

Check the voltage across terminals 3 & 4 of the electronic control circuit board with a voltmeter

Connect the dispenser to the power source

Disconnect the dispenser from the power source

Check the voltage across the tank heater terminals with a voltmeter

Connect the dispenser to the power source

Disconnect the dispenser from the power source

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

Disconnected 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 present as described check the wiring harness

Continuity between the left and right terminals on the contactor coil

If continuity is not present as described, replace the contactor

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

Disconnect the dispenser from the power source

Remove the top cover (3 screws) and front shroud assembly (4 screws)

Remove the top 2 screws and loosen 2 lower screws securing control panel to shroud

Disconnect switch wires from the CBA

Remove the large nut securing the switch

Installation in the reverse order

Sign off on the switch replacement