Ok, In the center of yor control housing behind the two control knobs is a 1/2" hole , put a flat blade screw driver in the hole and you should be able to advance the defrost timer. Turn the timer until the unit shuts off, this is the defrost mode. If you hear the freezer heater heating up, popping and cracking , you know the timer is bad, If the heater is not heating try replaceing the heater limit. It is near the heater in the freezer, two wires going to it. Part # 4387503. Hope this helps!
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Chuck G.
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