Anytime a microwave runs but does not heat means that the magnetron ( Its purpose is to generate microwave energy. The high-voltage components accomplish this by stepping up AC line voltage to high voltage, which is then changed to an even higher DC voltage. This DC power is then converted to the RF energy that cooks the food.)
has failed and will have to be replaced. This is a dangerous repair because microwaves hold high voltage even when power is not being supplied to the unit, so it is highly recommended that only a qualified technician make this repair. The magnetron and also the diode that will need to be replaced usually run in the range of 140.00 -300.00 just in parts depending on the model. If you would like me to find you the part numbers I would be glad to if you give me the model number of the unit.
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