Bunn Hot Water Dispencer 43600.0028

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

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

Voltage across the red wire and black wire

If voltage is not as described, check the wiring harness

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

If continuity is not as described, replace the contactor

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

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

NOTE: Make sure 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

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 the wires to the tank heater

Remove the 8-32 nuts from the tank heater flange

Inspect the tank heater gasket and replace if necessary

Securely install the new tank heater. Be certain of a watertight seal

Refer to schematic wiring diagrams when reconnecting the wires

Sign off on the tank heater replacement

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