Bunn Hot Water Dispencer H10X

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

Refer to Fig 2 when reconnecting the wires

Review the initial set-up procedures on page 6

Sign off on the electronic control replacement

Warning: This procedure requires trained personnel with PPE!

Disconnect the dispenser 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

Disconnect the dispenser from the power source

Reconnect the blue wire to terminal 1

Connect a piece of insulated jumper wire to terminal 4

Both wires removed from the limit thermostat terminals

Two #10-32 nuts removed attaching the limit thermostat to the top of the tank

New limit thermostat installed and secured into place with two #10-32 nuts

Wires reconnected according to schematic wiring diagrams

Sign off on the thermostat 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

Disconnect the dispenser from the power source

Disconnect the thermistor from J5 on control board

Loosen the set screw and the two screws securing the two half blocks together. Remove thermistor assembly from overflow tube

Install new thermistor on tube and slide down until it contacts the flared end. NOTE: It's critical that the thermistor be centered directly under the tube opening

Snug the set screw so the block assembly does not move around easily

Connect the thermistor to J5 on control board

NOTE: DO NOT TEST OPERATION WITH PANELS REMOVED, AS AIR MOVEMENT CAN HINDER PROPER READINGS ON THERMISTOR

Sign off on the steam sensor replacement