Bunn Hot Water Dispencer H5X 43600.0028

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

Voltage across terminals 3 & 4 of the electronic control board is within the correct range

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

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

Voltage across terminals 1 & 4 of the electronic control board is within the correct range after a delay of approximately 5 seconds

If voltage was not present as described, replace the electronic control board and the temperature sensor in the tank lid

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

Voltage across terminals 1 & 4 of the electronic control assembly is within the correct range after a delay of approximately 5 seconds

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

Remove both wires from the thermostat terminals

Remove the top lid from the dispenser to gain access to the thermostat bulb

Remove the thermostat bulb by firmly pulling up on the capillary tube at the tank

Remove the two #6-32 screws holding the thermostat to the mounting bracket

Fasten the new thermostat to the mounting bracket

NOTE: Make sure that the capillary tube is away from any electrical termination and is not kinked

Slide the grommet to the red mark on the capillary tube

Insert the bulb through the hole in the tank and press the grommet firmly and evenly so that the groove in the grommet fits into the tank

Refer to FIG. 10 when reconnecting the wires

Disconnect the dispenser from the power source

Check the voltage across the terminals of the tank heater with a voltmeter. Connect the dispenser to the power source.

Disconnect the dispenser from the power source

If voltage is present as described, proceed to next step

If voltage is not present as described, replace the tank heater

Remove the tank heater from the tank lid and inspect it for cracks in the sheath

If the sheath shows no sign of damage, proceed to next step

If the sheath is damaged, replace the tank heater

Remove all wires from the level control board

Remove two #8-32 screws holding level control board and mounting bracket to the component bracket

Install the new level control board and mounting bracket to the component bracket

Upload a photo of the reconnected wires

Sign off on the board replacement