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Re:Kenmore microwave model number 721.6389300 Hi this "Over the Range Microwave" makes a low buzzing sound while running. It heats food perfectly well. Any help would be appreciated. Thank you.

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  • Microwave Ovens Master
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Assuming your fans are working, this may be a magnetron on its way out.

If it's within the 1-year warranty, I'd call Sears for service right away.

Otherwise, I wouldn't leave it alone while running, just to be safe.

We're happy to help and we appreciate your thoughtful rating of our answer.

Posted on Jun 29, 2008

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1 Answer

Kenmore Over the Range Microwave making buzzing sound and not heating


This is a strong indicator the magnetron is fried, also! this is the most expensive part to replace in the microwave oven, and in most cases cheaper to replace the whole unit.

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If it does not heat and makes a loud buzzing sound, it usually means that the magnetron has failed. It the part that generatest the microwaves that heat the food. Replacement costs for magnetrons is almost as much as a new oven, so it rarely makes sense to fix. Sorry.

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What you are describing is a problem with the magnetron and it has become faulty, that is the main part that heats the food, the growling sound indicates it is loading down the power transformer that energizes the magnetron. The repair cost will not justify the expense "costly" replacement of the microwave oven "cheaper" in the long run.

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When the oven is running, does it make a loud buzzing or humming sound? If it does, then the problem is the magnetron, the part that generates the microwaves that heat the food. It not worth fixing since a new magnetron will cost almost as much as a new microwave. Ask your landlord that you need a new microwave oven. Sorry.

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Kenmore microwave


Since it's under warranty, they will replace or repair it at their choice, and if they replace it, it will be the same model or a "like model".

I'd ask them about it.

We're happy to help and we appreciate your thoughtful rating of our answer.


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Have you tried putting a cup of water in it and cooking on a low power level? If it buzzes only when it is on the cook cycle, that would narrow it down. More detals might help us help you, including the model number.

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