| You may have four things that could cause this problem. You have an ADT (defrost timer device), thermistor, defrost limit switch, and defrost heater. If you have a reading on the defrost heater, it should be good. The most common problem is the thermistor, followed by the defrost limit switch. I really can't see from all the frost, but I think the thermistor is that little white thing in the upper right hand side. The defrost limit switch is the one ecman51 talked about. It will have two leads connected to it, and is in series with the heater. The other thing would be the ADT electronic device that turns on the defrost circuit as it is needed, located in the refrigerator section somewhere.
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