I have a 2011 KitchenAid microwave (khms2040wwh-1) that just died on me. I replaced a fuse, but it blew the second I tried to heat something. How do I trace the short? This oven has not been knocked about or previously worked on. I don't know how trace the source of the overload without taking the whole thing apart.

William Miller

• 9179 Answers
• Posted on Jan 13, 2008

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.

SOURCE: Short circuited Whirlpool MH1150XM while changing the bulb underneath. Need help to fix it, thanks :)

We replaced the board behind the control panel. $130.00. If you do this make sure you can put the wires back the right way. My husband finally got it and our micro is working like brand newThanks to all who tried to help.

SOURCE: Microwave oven blowing 20 amp ceramic fuse

Chances are if the varistor fails, it fails drastically causing a short circuit across the supply. It will sit across the supply (it will look like a thick ceramic capacitor) and you can check for continuity after isolating that at one end. If it shows low resistance (it should show almost open circuit with a Digital meter), replace it.

It need not be the culprit. If you are familiar working with High voltage circuits ( they are lethal inside a microwave ovens as the current capability is high here), you can discharge the doubler capacitor and isolate the high voltage diode to check for shorts in the HT area.

SOURCE: Oven just died on me!

The same thing just happened to ours which is just one year new. Waiting to hear if anyone can offer suggestions/feedback.

Terence Fourie

• 909 Answers
• Posted on Sep 17, 2009

SOURCE: Viking Microwave Model VMOC205SS little over 4

9 amps is approx. correct. Does magnatron make an odd sound when running? If not, you will need to discharge cap then clean terminals with alcahol. Replace diode as well. Should run correctly.If blows again, replace magnatron. Suggest you put a 12 amp fast blow fuse in circuit and nor a 20 fuse.If you dont have a grill or an oven, use a 10 amp fuse.