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

Disconnect the dispenser from the power source

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

Check the voltage across the red wire and black wire with a voltmeter

Disconnect the dispenser from the power source

If voltage is present as described, proceed to #5. If voltage is not present as described check the wiring harness

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

If continuity is present as described, reconnect the wires and proceed to #6. If continuity is not present as described, replace the contactor

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 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

Warning: Ensure the dispenser is unplugged before starting the procedure

Both wires removed from the thermostat terminals

Top lid removed from the dispenser

Two #6-32 screws removed from the thermostat

New thermostat fastened to the mounting bracket

Ensure that the capillary tube is away from any electrical termination and is not kinked

Grommet slid to the red mark on the capillary tube

Bulb inserted through the hole in the tank and grommet pressed firmly