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Freezer Coils Frosting up

The 5 most common part(s) or condition(s) which contribute to the symptom Freezer coils frosting up are listed below. Check or test each item and watch any available videos. If you are still unable to solve the problem you may need to do additional research and troubleshooting. Remember, with our 365 Days. Period.® return policy you can return any part for any reason. So, go ahead and buy it to try it. No other parts retailer offers this unconditional return policy.


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For the symptom you selected, these are the most common parts or causes, ordered by the likelihood of fixing the symptom.

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Defrost Timer

If the freezer evaporator coils ice over, the defrost timer might be defective. Several times a day the defrost timer turns on the defrost heater for a few minutes to melt away any ice that may have accumulated on the freezer evaporator coils. In order for this to work, the defrost timer has to be advancing properly. If the timer is defective it may not advance and turn on the defrost heater. If the defrost heater doesn't turn on, the evaporator coils will ice over and eventually no air will be able to travel through the coils to provide cooling to the freezer. The defrost timer should be replaced if it is not advancing, it cannot be repaired.

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Defrost Heater Assembly

If the freezer evaporator coils ice over, the defrost heater assembly might be burned out. Several times a day the defrost heater assembly turns on for a few minutes to melt away any frost or ice that may have accumulated on the freezer evaporator coils. If the defrost heater assembly has burned out, the frost will build up on the coils and eventually no air will be able to travel through the coils to provide cooling to the freezer. The defrost heater can be checked for continuity. If it doesn't have continuity it should be replaced.

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Defrost Thermostat

If the freezer evaporator coils ice over, the defrost thermostat might be defective. Several times a day the defrost heater turns on for a few minutes to melt away any frost that may have accumulated on the freezer evaporator coils. In order for this to work, the defrost thermostat has to sense that the coils are cold enough. If the coils are cold enough the defrost heater will turn on. If the thermostat is defective it may not be able to sense the temperature of the coils and then won't turn on the defrost heater. If the defrost heater doesn't turn on, the evaporator coils ice over and eventually no air will be able to travel through the coils to provide cooling to the freezer. The defrost thermostat can be checked for continuity. It should have continuity when it reaches the low temperature of its operating range.

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Freezer Door Gasket

If the freezer door gasket is torn or defective, or if the door is not shutting tightly the evaporator coils ice over. This happens because humid air from the room is drawn into the freezer through the opening at the gasket. As the humidity comes in contact with the cold evaporator coils it condenses and freezes. Normally the defrost system removes this frost and ice. However, if the freezer door gasket is defective the evaporator coils ice over too quickly and the defrost cycle cannot keep up.

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Refrigerator or Freezer Door Gasket

If the refrigerator or freezer door gasket is torn or defective, or if the door is not shutting tightly the evaporator coils ice over. This happens because humid air from the room is drawn into the refrigerator or freezer through the opening at the gasket. As the humidity comes in contact with the cold evaporator coils it condenses and freezes. Normally the defrost system removes this frost and ice. However, if the refrigerator or freezer door gasket is defective the evaporator coils ice over too quickly and the defrost cycle cannot keep up.

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