Whirlpool WP67001794 Defrost Heater (Evaporator) OEM Part

The cooling coils were iced-up. The ice was blocking air flow to the refrigerator. This resulted in the freezer working fine while the refrigerator was warm. Called AppliancePartsPros and talked to Sally. Sally was a big help in troubleshooting the problem. I ordered and replaced the cooling coil heater. If you attempt to do this repair yourself, BE CAREFUL, the cooling coil fins are sharp.

I called about possible failure of components and was advised that the issue could be the defrost heater, thermostat, or timer. I was given the information to test existing components. The timer was not required in my unit. I tested the heater coil and thermostat. The thermostat did not pass testing specifications. Replacing the thermostat rectified the problem. Most of my time (two hours) was spent defrosting the evaporator coil so I could access the components for testing. Replacement of the thermostat and replacing all protective covers only took about 30 minutes. Appliance parts pros allowed return of unused purchased components. I paid for return shipping. Seemed fair to me.

Although I replaced the heater coil the root cause was the sensor on evaporator return copper tube. I ordered both parts and choose to test the heater coil first. To rest heater coil I had to remove coil in order to access connectors at each end to measure resistance. Due to the level of difficulty in removing coil,I choose to replace coil while I had it out. The sensor is a much easier repair. The online Videos would have been nice before I purchased parts. One of the videos (heater coil replacement) didn't represent the model I had but was general enough for me to understand the procedure.

I replaced the heater , the control thermostat for the heater , and the motherboard. An electrical surge from the power company took down several components. Don't forget the surge protector!

With a new heater evaporator.