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Microwave blows fuses

Our microwave blew a fuse (125/250V 20A). I replaced it yesterday and it was working fine. Opened its door this morning, light went on then fuse blew. Ideas?

Posted by Anonymous on


1 Answer

SD Tech

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  • Microwave Ovens Master
  • 14,553 Answers

A short likely in the wiring for the light or at the safety switch embedded on the side where the door closes----be careful as a 20 amp fuse takes something major to take out.
(for it to blow)

This might be best left to a qualified service person.

Posted on Dec 22, 2012

  • Anonymous Dec 22, 2012

    Thanks so much, SD Tech! Thought it was odd though that it worked for a day, then popped just from the interior light. But what you say makes sense!



5 Related Answers


  • 19 Answers

SOURCE: Ge Spacemaker microwave jvm240 wv Micro hood combo.

sounds to me like the magnatron has shorted out. i don't know of a way to test them unless you have some high dollar equipment. a continuity test prob wont tell you anything. what reading did you get on the cap when you tested it?

Posted on Jan 06, 2008


William Miller

  • 9179 Answers

SOURCE: 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: http://tinyurl.com/gv383

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


  • 550 Answers

SOURCE: fuse keeps blowing.

couple questions -
what else is on the circuit,
and what current does the oven need

there are whirlpool over-range models with
1200watts of microwave,
1500watts of convection power, a
60watt bulb and a
375watt fan

over 15amps -20amp circuit needed

if you inadvertantly replaced a higher current fuse with a 15amp fuse, it will blow every time.
the install guide http://www.whirlpool.com/assets/pdfs/product/ZINSTALL/8206589.pdf reccommends 20amp
not a solution, something to check,

Posted on Oct 14, 2008


  • 86 Answers

SOURCE: keeps blowing fuses

This problem is just like my own microwave, replace the shorted HV capacitor

Posted on Jul 27, 2009


  • 612 Answers

SOURCE: Ewave over the stove microwave fuse blows when I

The light is the only thing that comes on when you open door. You either have a shorted door switch (Micro switch) or a shorted bulb. You have either a shorted bulb or bad socket. From my experience, it's the bulb. Just because it may seem to start to come on when you open the door, it's most likely bad. At least it not expensive.
Please rate solution

Posted on Aug 28, 2009

Testimonial: "Thanks, yes the light comes on for a second then fuse blows. I'll replace it, thanks!"

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Kenmore 363.62709200 'microwave/hood combo' hums and blows main fuse when door is closed has new door switches

You would better served replacing unit. Throwing parts at it is an unnecessary step.

Panasonic inverter microwave ct579 killing the 10a fuse. Uk.

Check its transformer so that you will know its fuse size

Why is my GE Advantium SCA2001 blowing the main fuse?

Yeah pal, you've not gone deep enough yet. You'll find a power wire bare inside the unit, pull it apart and tape that wire up to stop it from grounding out and blowing the fuse.

Why does ge microwave blows fuse when door is opened?

Inspect the door switches and the wiring in the light bulb circuit. If the problem is a door switch, it will probably be visibly broken, or there will be burn marks on it. It's also possible that the door switch bracket is bent or broken and allows the terminals to short to the oven frame. Check the lamp socket - if it is cracked or burned, it should be replaced.

Also look for signs of arcing or burn marks on the controller board, especially near the relays (usually black plastic boxes about 1" x 1' x 3/4' mounted near the wire terminals or wire harness connector).

As a general note, it is rare for a fuse to fail by itself. If you find a blown fuse, look for a cause before replacing it. This may prevent wasting another fuse.

Replaced 20A fuse - now have blinking lights

either the cutoff is open circuit or closed circuit if you get any reading at all it is good. I would look at the control panel look for overheating components. Tap any relays to release them if they arced inside. Whenever a microwave blows a fuse it is time to replace the huge capacitor at the back and possibly the magnetron. I resurrected my Sharp R9H66 Microwave Convection Oven easily. Had to replace the magnetron twice in the last 5 years

Yesterday, my sharp carousel r-1460 went dead. I took apart the front keypad and replaced the 20amp fuse behind it. the microwave light and fan work.But, when I start microwave to cook something, pop! fuse...

If the 20A fuse is blowing, it is often the high voltage transformer or magnetron. If this is the case, and the microwave is not under warranty, replace it. Residential microwaves are generally considered disposable. Parts and labor are just too expensive. A magntron or transformer can cost more that half the cost of a new microwave.

Microwave blows the fuse when you push the start button on the panel

This will be either a faulty door interlock switch or High voltage component. You will need to remove the outer cover after first disconnecting power. Discharge the high voltage capactitor!
Check the door switches are operating correctly if so move on to the high voltage components starting with the transformer

FUSE on Microwave still blows

Sounds like a power supply problem. There is a capacitor in the unit which often gives problems. This may be beyond non-professional help and may have been started when you had the other failure.
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