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Why fuse keep blowing after changing it in microwave 250 volt 20 amp fuse lcd lights start running then goes back out

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: Fuses keep blowing out

Yes a fuse blows because there is an internal short in the unit. The more you replace the fuse and hopes it will fix it, the more damage you may cause and maybe even cause a fire. A fuse blows in a piece of equipment as a safety feature. most fuses do not blow because they simply go bad, they blow because of a problem. First thing would be to check the door switch alighnment. next would be to check the Hi voltage diode and the capacitor, next test should be the magnatron for a short. If you do not have any knowledge on microwaves, call in a pro to assist you in this repair ans there is alot of high voltage inside this puppy. Good Luck

Posted on Apr 08, 2007

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SOURCE: 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.

Posted on Nov 19, 2007

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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:

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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SOURCE: microwave blowing fuses

Sanyo isn't that great of a manufacturer.. I had a microwave from them a few years back that did the same thing.. The wiring inside the microwave is shot.. if you were to open it up, you'd probably see some burnt wires from a short. If you use the microwave over a range, it may be because of grease build-up...

anyhow, its better that you invest in a new microwave, rather than fix it. It will be much more cost efficient

Posted on Jun 02, 2009

  • 8909 Answers

SOURCE: tappan microwave over blows 20

Either or both. If the magnetron goes short circiut the the diode wil fail as well.

Posted on Dec 24, 2010

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Dec 06, 2015 | In Microwave Ovens

1 Answer

I have a microwave JVM3670SK06  ge what amp fuse does it use

I found a good site to find parts for the microwave. It has the fuse for $7. GE WB27X10388 Line Fuse PartSelect
Here is another search form different sellers.
WB27X0007 GE Microwave Ceramic Fuse Replacement

The fuse info
  • 250 Volt.
  • 15 Amp.
  • Type: Fast Blow.
  • Approx. 1.25"L.

Oct 18, 2015 | GE Microwave Ovens

1 Answer

Is there a design change for the 20amp[4amp ceramic minifuse in- line holder] to just using a regular 20 amp 250 volt fusetron?

You can use a regular glass fuse as long as it's rated the same and fits the holder. Microwave ovens use a ceramic fuse to prevent the possibility of little pieces of glass under the cover if the fuse should break. But other than the body the fuses are the same.

Apr 19, 2011 | Whirlpool MH3184XP Microwave Oven

1 Answer

Microwave will not come on, just dead. any suggestions? We cannot find our manual

There is a ceramic fuse inside (automotive style fuse) which may blow in the event of
a power surge or failing magnetron. These are available at most radio shack or
appliance parts store for a couple of dollars. Make sure to unplug unit before removing
cover and be very careful around the capacitors as they can retain a high voltage
similar to an electric fence. The fuse will be ceramic with metal ends , replace with
equal value amps and volts (stamped on metal bands at each end) for example
5A 250 V is read as 5 amps at 250 volts. These are slow blow fuses and cannot be
replaced with just automotive fuses . Hope this proves helpful

Feb 27, 2011 | Microwave Ovens

1 Answer

We have a GE Microwave 1440 and the fuse keeps blowing. It blew at the beginning of December and we changed it, it then blew again 3 weeks later and we changed it again. Then just yesterday it blew again...

Each time that it has blown can you remember if you had it set for a higher time? Reason I ask is, it can be any of the components inside that overheats after running for longer periods and the fuse is the part that will (or should fail) if the system overheats. If it's blowing that much, I can tell you it will be better to purchase a new one considering some of the components in a microwave is about $200 each and if the board is bad it's just as high. I say buy a new one and therefore you will have a warranty. We bought a home 3 years ago that came with the same microwave and it lasted about 1 year, and having the same issues. Good Luck.

Jan 03, 2011 | GE JVM1440 Microwave Oven

1 Answer

Keeps blowing 20 amp cermaic fuse when door is opened on microwave

I finally was able to fix similar problem. The "primary" door switch (top switch) had a burned contact inside the switch body, as well as burned surrounding plastic. It would no longer "click" and tended to stay in "closed" position. [The switch is a "normally open" design (NO).] When this occurs and the door is opened, the "monitor" switch causes the fuse to blow out. GE wants $50 for this part. However, I was able to find a universal design of microswitch at Fry's Electronics. It had the same rating (15 amp at 250 volts), same body size, both NO and NC terminals, but with a lever arm which I had to remove by opening the case. Cost was $2.47 + tax. (PRICELESS!). It works well now.. I also had to buy a set of Torx driver bits for tamperproof screws to be able to remove the oven cover. (The hole in the end of the bit goes over the tamperproof pin of the screw).
I also viewed a YouTube video which was helpful at

NOTE: I believe this problem occurs from opening the microwave door before the cooking is finished (without either pushing "pause" or "clear/off" buttons). This can cause a momentary "arc" between the switch contacts which, over time, will pit and burn the switch

Dec 30, 2010 | GE JE2160 Microwave Oven

1 Answer

I have Amana Radar Range microwave. The repair guy was just here (fixing my real stove) and told me to change fuse to ''20 amp 250 volt fast acting ceramic fuse.'' Where is the fuse on this microwave?

first unplug your microwave and let sit for awhile to drain any stored energy that may zap you. then, if it is an "otr" there are 2 screws in the vent slats on top that you remove. once removed, you lift up on the control panel and it tilts out. voila! there is your fuse. pop it out and pop in a new one. ceramic 20 amp is correct. check your old fuse to be sure it is 20, not 15 though.

Aug 26, 2009 | Microwave Ovens

2 Answers

Cookworks microwave not working

replace the fuse see if it blows again you can get those at radio shack 250 volt either 15 or 20 amp get 3 or 4 of em

Jul 29, 2009 | Microwave Ovens

2 Answers

Blowing 25 amp fuses

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.

May 21, 2009 | Emerson Black Microwave Oven

1 Answer

Fuse keeps blowing.

It appears like the high voltage capacitor is shorted or the diode connected to the capacitor. You might want to check the monitoring switch as well if the capacitor and diode are good.
Click here for more info on how to work around these high voltage devices.
Let me know if you need further assistance.

Oct 16, 2008 | Whirlpool MH6140XK Microwave Oven

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