Hello, This sounds like you should look at 2 parts. Check your schematic which is usually glued to the motor compartment and look for the Dryer Heater and the Cycle Timer. The Cycle Timer is a device which triggers the Heater in Self-Defrosting Refrigerators. You need to determine if it is working, some have a external twist button which can be used to engage the Defrost Mode. The second part is the heating element which is turned on by the Timer. It is usually within the cavities of the inner shell of the refrigerator box.
Although all Refrigerators are meant to cool and freeze, the Self-Defrost models regularly generate a small amount of heat to lower humidity and to keep the box from icing up as yours has done.
I have had good experience with a business called Servall, which has service parts for all major Appliances. They may be in your phone-book, they are on the Web, and they have an 800 number. You may be able to obtain schematics and info from them and they have been in business since 1929.
Another source of diagrams can be your Library. There are repair books for major appliances there, even by Brand. I hope my solution is very helpful to you. I do not have Servall's number at hand, but it is an affliation of Service companies and one may be a local number for you. If you can find the schematic on your unit, a continuity test will tell you the condition of the 2 parts I mentioned.
For the timer, it must be turned to an active position to register.
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