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Microwave makes loud buzzing sound when on and no heat

Microwave all of a sudden started making loud buzzing sound when turned on and no heat.

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Re: Microwave makes loud buzzing sound when on and no...

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.

Posted on Mar 21, 2007

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1 Answer

XL1800 buzzes but heats

If the magnetron was making louder noises prior then replace the magnetron. While the cabinet is open make sure to look for burned wires, check the continuity of thermal cutoffs, and check the main circuit-board for burned traces or components. The relays in most electronics are known for arcing (spot welding) and staying in the wrong position. Tap them hard with the back end of a screwdriver.
You may have to replace the capacitor too. During all of this use safe electrical practices by having the power cord unplugged. The capacitor could still have a high charge on it so be careful.

May 11, 2013 | GE XL1800 1100 Watts Microwave Oven

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.

Jul 18, 2012 | Microwave Ovens

1 Answer

My microwave no longer heats anything and also makes a really loud buzzing sound when i attempt to use it.

The problem is most likely caused by a defective magnetron that "heats the food" is loading down the high voltage transformer causing it to make a loud buzzing sound. The cost to repair (depending on make and model) will probably approach the cost of a new microwave oven when you factor parts and labor.

Jan 23, 2011 | Microwave Ovens

1 Answer

Microwave making loud noise behind control pad and won't heat

Sounds like the magnatron (the bit that creates microwaves) could be goosed. Remove outer cover ( Isolate from the electric supply then remove screws at bottom on the sides).

Find big lump that says on magnatron with model nos etc on, any good electrical supply shop ( Maplins etc) should stock new one.

It is easy to change. It took me about half an hour having never done one before.

Buyer beware the price of the parts could be in excess of a new microwave.

Shop around

Sep 15, 2009 | Panasonic NN-T993SF Microwave Oven

1 Answer

Makes a loud buzzing noise and does not get hot

Have seen this many times.

Sounds like a bad CAP since a bad diode would blow the fuse and a bad mag would likely do the same thing.

Since yours is making the loud 60hz buzz you need to replace the capacator that will likely fix the problem. A $10 fix

Jan 06, 2009 | Kenmore 62622 Microwave Oven

3 Answers

Ge microwave - making noise

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?

Mar 07, 2008 | Microwave Ovens

1 Answer

Mwave made loud buzzing noise then didn't heat up anymore

When there's a loud buzz like that, it does not heat, and does not blow the fuse, it is usually a defective magnetron. Did it sound something like someone making a "gurgling" sound into a coffee cup? I think this has a a one-year warranty, with n five-year warranty covering the magnetron. You can find a local Amana-authorized servicer here:

Mar 03, 2007 | Amana AMV1162 Microwave Oven

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