Bunn Hot Water Dispencer H3X

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 Dispense Switch Replacement

Warning: Disconnect the dispenser from the power source and turn-off the water supply to the dispenser

Pink wire removed from terminal 5 of the electronic control board

Voltage across the solenoid valve coil terminals

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

Both wires removed from the solenoid valve coil terminals

Continuity present across the solenoid valve coil terminals

If continuity is not present as described, replace the solenoid valve coil

Solenoid valve coil action checked

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

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

Disconnected the dispenser from the power source

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

Voltage across the black wire removed from the limit thermostat and the white wire or red wire of the terminal block

Voltage was present as described

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

Checked the dispenser wiring harness

Checked for continuity across the terminals of the limit thermostat

Warning: Ensure the device is unplugged before starting the procedure

All wires removed from the electronic control board terminals

Six 6-32 screws removed from the electronic control board

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

Temperature sensor, overflow tube temperature sensor, and indicator wires attached to the new electronic control assembly

New electronic control board fastened 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