Question about Refrigerators
Freezer icing up
You have a problem in the defrost circuit, most likely the defrost heater or timer, there is also often a thermal limiting device that prevents the heater from going into nuclear meltdown incase it ever gets stuck in an on position.
Most residential refrigerators only actually cool the freezer portion. There is an air door and fan that takes the cold air from the freezer and pushes it into the refrigerator portion. When the defrost heater stops working ice will build up in the freezer, this then blocks the flow of air into the refrigerator and the problem you indicated is the result.
Posted on Mar 11, 2009
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