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dont use the microwave until you retrieve what dropped inside when you removed the port. The grinding is most likely a foreign object that is hitting the moving parts of the microwave and causing sparking. It can catch fire
Waveguide coverSparking and
arcing in a microwave can be caused by a damaged waveguide cover. Try
removing the waveguide cover to see if the problem persists. Once
removed, the waveguide cover can be inspected for burns, which will
indicate if this is the issue. If the waveguide cover is burnt or will
not stay in the proper spot it will need to be replaced.
sparking or arcing in your microwave is near a rack support, any exposed
metallic area can be covered with a microwave cavity support. It is
also recommended to replace the rack supports in this situation to
ensure the issue is resolved.
Cavity paintIf sparking
or arcing in the microwave is visible on the side walls, the paint
covering the metallic areas could have worn off or chipped. This can
possibly cause pitting in the side walls or ceiling. If this is the
case, it can be repaired with microwave cavity pain
That will be caused by condensation affecting the controls of the microwave oven. Not a lot can be done about that except cut down on the steam maybe or wait for the temperature to rise slightly avoiding the condenation problem.
Exactly the same problem over here, but after our house was hit by lightning, so not really surprised about the cause of the problem. If you look closely, you can still see the displays on a very low light level. I can still choose a microwave program, turn the time etc, and see the time changing, but start won't just just work.
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