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Microwave keeps blowing fuse

When I start the microwave, it starts to make a buzzing sound then blows internal 20 amp fuse within seconds. What could be the possible problem and is it worth repairing?

Thanks in advance

the microwave made a buzzing noise and went totally dead. I replaced the internal 20amp ceramic fuse and set it for 1 second and it buzzed and blew the new fuse.

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Re: Microwave keeps blowing fuse

If it went dead almost immediately after pressing the Start pad, that\'s usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that\'s usually a failing high-voltage transformer.

Here are some links with info on part testing:

You can usually find helpful exploded view diagrams and order parts by
entering your full model number here:

Please write back with your brand and model number if you need further help.

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

Posted on Jan 13, 2008

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Hello friend, thanks for your post!

Based off the information you have provided I understand that your fuse blows every time your Electrolux microwave starts up. It sounds like it could be an issue within the control panel, capacitor, or circuit breaker. Because it could be a number of any one of several underlying causes, I would personally contact a professional to accurately diagnose your microwave to determine the root cause to reduce the risk of unnecessary parts-Matt

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GE Spacemaker microwave makes groaning sound when start button is pressed for a second or two then blows the internal fuse. After replacing the fuse everything seemed to work, lights, exhaust fan, cl

Could be a lot of things but most probably a shorted high voltage diode assembly. If not that then the magaetron or capactors. Remember be careful there are high voltages even when the oven is unpluged. The capactors are usually charged and must be discharged. If you don't know what yor doing then time to get a qualfied tech.

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My Whirlpool microwave MT6120XEB-0 keeps blowing the fuse. Inststalled new fuse and display and timer works. Cooking blows new fuse. It turns on, makes grinding sound and blows a new fuse within a second...

You almost certainly have a shorted high voltage capacitor.

See the safety warnings and help information here.

Chances are you will have to remove the oven from the wall to replace it.

You can download Whirlpool owner's manuals and installation instructions here.

You can find helpful exploded view diagrams and order parts by entering your full model number here.

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In that case the outlet your using is pushing out too much electricity. Try calling your local electric company for help or a professional electric repair man.

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Buzzes when starting then blows the fuse

there is an electrical problem.
my suggestion is that you will have to dispose that microwave and get a new one.
you dont want to chance a fire. andwave c yes mircroan cause fires.

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Emerson Mwg9111sl microwave blows 20 amp internal fuse instantly everytime.

check your thermal fuse its about 2 inches long white on the outside black on the inside it has 2 wires going to it check for

cotinuity becareful of the capacitor you need to disapate that first by touching the two teminals together with a screw driver

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Microwave keeps blowing fuse

If it blows the fuse as soon as you hit the START button, it's almost certainly a shorted high-voltage capacitor.

If it blows a few seconds after you hit the START button, it's probably the high-voltage transformer. You'll possibly also smell a faint electrical burning smell from the rear vent after you shut if off.

If it blows the fuse as soon as it's plugged in, you probably have a shorted door switch, a shorted varistor, or an internally exposed wire shorting to the chassis, etc.

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Fuses keep blowing out

In case it's still helpful, I'll inject a little sanity into the replies.

If the fuse blows as soon as you hit Start, it's probably a shorted high-voltage capacitor. That's usually economical to repair.

If the fuse blows a few seconds after you hit Start, it's probably a shorting high-voltage transformer. That's usually not economical to repair.

It's not radiation (non-ionizing RF by the way) that's the hazard, it's the voltages.

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WARNING: Microwave ovens are the most dangerous consumer appliance to service due to up to 5,000 V at high current inside. Even with the power off, there is a HV capacitor that can produce a lethal kick. This capacitor must be discharged before touching anything in the microwave generator circuitry. DON'T remove the cover yourself unless you fully undertand the SAFETY issues involved in working inside a microwave oven. A microwave oven is possibly THE MOST DANGEROUS common consumer product to service. About the only "easy" fix would be a blown fuse, if it keeps blowing, don't go any further unless you know what you are doing. Your likely options are a blown high voltage cap, diode, or the magnetron. Good luck(but luck has nothing to do with it ;] )

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