Check the door safety switches ... remove the cabinet and check the micro switchs you find involving the door with a volt/ohm meter
If you turn it on to cook and everything works like it's cooking,, is there a strange hum/buz to it? If so replace the magnatron and diode. There is a 10yr warrenty on GE magnatrons, so it would only cost the Home charge & labor if you call GE for service.
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whirlpool microwave does not heat
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