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Micowave is not heating up, and is making a

Micowave is not heating up, and is making a buzzing noise on the right side of the oven

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It may be a shorted diode in the HV power supply for the magnetron. Open the case to get to the part. Unplug the machine before opening anything. This is normally a high voltage area when running.

Posted on Jul 17, 2009

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Posted on Jan 02, 2017

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We have model FR185B-CON in our camper, when try to use the oven it makes a loud banging noise. Micowave works fine.


Check the air flow it's probably dirty clogged, don't use it till you find the problem, cuz it could over heat and catch it self on fire. Check the rotating plate inside, skipped gears maybe. Good luck

Jul 06, 2015 | In Microwave Ovens

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My microwave is making a loud buzzing sound. Inside the microwave, on the upper right side, is a square area with holes in it. It sounds like the buzzing is coming from behind those holes. Also, after...


THe buzzing noise is most likely coming from the magneton. The magnetron is the main component of the unit (it generates the microwaves). Replaceing it can be very expensive. You may be better off getting a new oven. Prices for new microwave ovens have dropped significantly.

Jun 12, 2011 | Microwave Ovens

1 Answer

No heat makes buzzing noise


if its making a buzzing noise, then the diode is bad and needs to be replaced.

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When the microwave does not heat the food, it means that the magnetron circuit has failed. It the part that generates the microwaves that heat the food. Often the part fails by shorting out causing a loud buzzing sound when you try to microwave something. The replacement part usually costs almost as much as a new oven, so it rarely cost effective to replace. Sorry.

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Similair problem, but no spark issue, just stopped working. No power at all...nothing. The unit is dead. What could be the problem?

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I would recommend changing the diodes as well. This will usually take care of the problem.

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I have a GE counter top microwave oven. When the oven starts cooking (the magnetron turns on) the oven makes a harsh buzzing noise. What is wrong and what should be done?

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