Question about Whirlpool MH7130XE Microwave Oven

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Fuse keep blowing up

My microwave started blowing fuse as soon as you start the microwave. I removed the fuse and just coneted the black wire. when started, it make very starnge noise. Please let me know what might be wrong. all other function works fine except heating.

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Aside from Garydales excellent advice here a couple of things to look for. Check your door switches, you have a primary, secondary and monitor switch on the door latch system. Another would be the capacitor. If it is bad it will blow the fuse. If the strange noise your hearing is a loud -rrrrrrrrr- it more than likley could be your capacitor and diode. Your magnetron should be covered under warranty for 5 years, part only. This is very high voltage in there,be careful..Catriver..post back.

Posted on Aug 30, 2006

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You have a short in the system. removeing the fuse was not a good thing to do. The fuse in a microwave helps keep the system from an overload which can and I have seen this blow-up. The micro pump inside might have a dead short it,

Posted on Aug 30, 2006

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I have serviced 100's of microwaves and the most common problems for microwaves not working 1)fuse blow(but display will be dark), 2)not plugged in(or house fuse blown) (microwave display is dark and other outlets would be off) 3) connections to one of the door switches is burnt out. The display is not dark but microwave will not work. The wire going to the switch looks black right at the switch.(this wire must be removed and a new connector attached to wire and then reattached to the switch

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If it happens when you push start it probably in the high voltage system. Depends on if your microwave has an nverter or a transformer, capacitor, and rectifier. If any of those parts are bad it wil lblow the fuse.as soon as you push start.

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You have 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:
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For more help from Emerson visit here or get help using your appliance at 1-800-898-9020. Get help locating a servicer or parts at 1-800-695-0098.

Emerson parts are distributed by Fox International and their number is 800-321-6993. Or you might try e-mailing researchdept@fox-international.com

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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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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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Replace fuse


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5 Answers

Microwave not works


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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