Chris for Model Number tfx22crxfww I noticed ice and frost building up on the evap coils in the freezer. Freezer works ok but refrigerator was cool not cold. I Checked the defrost heater and it was bad. Planning on changing the defrost heater, thermostat and defrost control timer all together. I did notice after thawing the freezer coils they frosted over again after about an hour. It starts toward the bottom and works up to the top. After about 10 days it was completely iced over again. Also, it seems like the compressor won't stop running. I haven't noticed it shutting off. Is the problem just a defrost problem or is there something else going on...low on refrigerant? The condenser coils are clear, evap. fan and condenser fans are running. When the freezer coils are not iced over everything runs/works great. Any help would be greatly appreciated.
Answer Hi Chris. What you are describing is a normal defrost failure. The compressor cannot satisfy the normal Fresh food temperature control setting, so it continually runs. The defrost thermostat controls the temperature rising of the defrost heater while in defrost so that it will ' open' and stop the electrical current to the defrost heater so the cabinet does not melt. It also closes (At a pre - determined setting such as 23 degrees) so when the defrost timer goes into defrost , then the heater can operate. You more than likely will not need the timer. The defrost heater part # is WR51X442. It comes with the defrost thermostat included. The defrost timer is part # WR9X489. I hope this helps. Thank - you. AP2061695 Read More... Answered by AppliancePartsPros.com | Friday, July 1, 2011