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I have a whirpol microwave mh7140fxb that quit working and when I replaced the fuse and turn it on it runs for a second then blows again. Any idea whats wrong?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

MicrowaveSvc
  • 9047 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:



http://www.microtechfactoryservice.com/cap_test.html
http://www.microtechfactoryservice.com/diode.html
http://www.microtechfactoryservice.com/mag_test.html
http://www.microtechfactoryservice.com/xformer.html




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

MicrowaveSvc
  • 9047 Answers

SOURCE: GE Dual Wave II microwave oven blowing fuse

It sounds like a shorted high voltage capacitor, a fairly cheap fix. But if it's good, I would suspect the high voltage transformer.

Here are some links you or a friend can use for test help, but read the safety warnings first:

http://www.gallawa.com/microtech/cap_test.html
http://www.gallawa.com/microtech/xformer.html

There should be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

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

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Sep 06, 2008

AlmostBob
  • 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

MicrowaveSvc
  • 9047 Answers

SOURCE: keeps blowing fuses

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

Here is a link you or someone you know can use to test it, but please read the safety info:
http://www.gallawa.com/microtech/cap_test.html

You can order Panasonic parts from Tritronics here or by calling 866-779-5835, but if you don't find what you're looking for there, try here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Nov 09, 2008

tbirdfan1
  • 3051 Answers

SOURCE: Microwave Blowing Fuse. Fixed. After Day, Fuse Blows Again.

Hello there:
If you have all ready changed out the fuse and it has happned again i would first check to see that the fuse is the right one for the machine (i am sure that you did this but please recheck ) next i would look at the controle board as the next culprit it maay be failing expecially if there were any pops ar sparks that was noticed before the initial failure.
Also check to see if all of the wires by the board a re not loose or looked burned ar if there is any grease or anything like this around the area
And finally check to see if the plate is turning ok and not sticking cause this would cause the microwave to overload and it wil make every fuse you put in there fail after just a couple of uses ok
SO please try all of these things that i have explained to you
I hope this is very helpful for you.
Best regards Michael

Posted on Dec 12, 2009

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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

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