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Works but don't heat the food - Tappan Microwave Ovens

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This is definitely a major issue, and I see it quite a bit. The first thing I would test is a secondary interlock switch
If the switch is fine then the question is: does your microwave make any unusual noise?

If it does then most likely the problem is a shorted rectifier or a shorted magnetron tube If there is a continuity across the rectifier terminals (using a regular meter) - it has to be replaced.

If there is a continuity between any of the magnetron tube terminals and the body of the magnetron tube - it has to be replaced.

In case if the high voltage transformer shorted out, in most cases it should produce an electrical burning smell and a smoke.


But your best bet is to take it to a professional, or just replace the microwave. It is a major repair in any case.
Thanks Tim

Posted on Oct 02, 2010

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