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Microwave makes a strange humming noise when it is working - sounds like a vibration of some kind. Does not always happen. Somethings it starts once the microwave has been running for a few seconds. Have a spacesaver GE built in microwave over my stove.

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Assuming nothing's loose (such as from past repair attempt) then it may be the magnetron failing.

Your best bet is to keep using but (as always) do not leave it unattended while it's running.

Then if things get worse in some way, that would be a harder failure that can be assessed more easily.

If you are close to the end of the warranty period (1 year parts & labor or 9-year magnetron, e.g.) I would not wait past then.

GE Customer Service is here if you would prefer service now and want to find your nearest GE-authorized servicer.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Oct 20, 2008

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This is the power transformer humming, sometimes when transformers get older you get vibrations in the windings due to magnetic fields generated within the transformer which causes the humming noise, It's more annoying than anything and won't affect the operation of the microwave.

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Ther is a loose peace of metal in the magnetron, it is not a big worry, it's just noisy, i have a noisy microwave and it is working fine for 10 years now, if you use the defrosting mode you should hear the noise (on and off) because in the defrost mode the magnetron energises on and off, it could be the cabinet vibrating as well look for loose peaces of metal

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Possibly, the "fault" was the buzzing in the first place! Buzzing is usually a cabinet vibration caused by magnetic fields from the "gubbins". If the buzzing should occur again, try pushing/ pulling/ poking the cabinet while the oven is running, you may find a position that causes the buzz to stop.
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I thought I had answered this, but maybe the reply didn't post... Vent cap? Could you be more specific about what you tried and what the noise is like - where it seems to be coming from? It looks like on some of these models, the high-voltage section emits some interference which some people are blocking with a foil or metal shield. If they do that, they should definitely insulate it to prevent shorts. Another cause of vibration on these models is a fault in the stirrer located above the cover on the ceiling inside the cooking cavity. Feel free to post back so we can help further.

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