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There could be a variety of reasons why this happens, but the likeliest
reason is the secondary interlock or monitor switch is broken. These are micro switches that tell the microwave that the door is closed. If this switch is broken, then the microwave thinks the door is still open and the carousel table won't turn, and the oven will not heat up.
I replaced an interlock switch last Saturday. The switch was $7.00 and took me an hour.
Ask your local repair person to test the interlock and monitor switches first, then go from there.
It sounds like a failing magnetron. Sometimes they can be intermittent before they finally fail for good.
Chances are your oven has a 5-10 year warranty on the magnetron.
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A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode,
but a sound like gurgling into an empty
coffee mug is one symptom of a failed magnetron, and yet the mag can be bad
without that sound.
Q - The microwave display counts down and the inside light is on, but nothing is heating and the fan is not running. A - This most commonly is abad door switch, other possible problems are a faulty relay or solder joint on the power module, but a bad door switch is most common. Q - My microwave is running and sounds like it is working but will not heat up anything. A - Many thing can do this but, common things are....loose high voltage wire.....poor solder joint on board.....magnetron.....power relay..... Q - The microwave makes a loud "hum or buzz" noise but will not heat up the food? A - 9 times out of 10 this is usually this is a bad magnetron, the other time is sometimes a bad high voltage diode. See components section.