Question about Whirlpool MH7140XF Microwave Oven

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Microwave malfunction Microwave operation light and sound appear normal, but no cooking takes place.

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This could be a diode between the capacitor and magnetron, (its like a fuse) i do not recommend self repair, but give you this info as a guide to what maybe wrong, microwaves contain high voltage and care should be used if you do attempt repair hope i have helped a little

Posted on Oct 04, 2007

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Unscrew the screws holding the exterior shell to the unit, then lift off. Now unplug the magnetron and take it in the shop to match up the #s so you can get an exact replacement. Now install the new part and you should be re-heating left overs in no time. Make sure you discharge the capacitor before poking around inside or you will shock the hell out of yourself. Unless your sadistic and like that sort of pain, then forget about the last suggestion.

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Wow. A shocking tale...

It sounds to me like they're guessing ("shotgunning" as it's called) and don't have a clue how a microwave works or how to fix one.

They can't possibly be a Whirlpool-authorized service center can they?!

They apparently replaced two parts that did not fix it, so they should not charge you for those parts, or they should put your old parts back in. What are the odds they would have them still?

If you've not paid them any (or much) money, I would tell them to keep the oven and buy yourself a new one.

If you have paid them anything, I would insist on a full refund and your microwave back with all your original parts (if available).

If you hired someone to paint your house, and they only painted your window panes, should you pay them for the labor or the paint??

But to be honest, I would not trust this shop as far as I could thrown it. If you do get this oven out of the shop, the next servicer may find a whole lot of bad parts all of a sudden... Know what I mean?

If they give you any more trouble, I would go straight to your State Attorney General's Web site and file a complaint with their consumer protection division (or at least threaten the shop with this action).

A State government's Web site is at www.state.xx.us or www.xx.gov where xx is replaced with your Stat's official two-letter abbreviation.

Good luck.

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

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Sounds like you just fried your magnetron. Normally when they go bad, they make a very loud noise like what you described. The smell concerns me because you may have ruined the waveguide as well. If the magnetron burns through the protective painted surface of the waveguide, the waveguide is ruined. In most microwave ovens this means replacing the entire unit because the waveguide is not replaceable. Putting a new magnetron in a damaged waveguide will result in the same arcing and eventual failure. In addition to the magnetron, the following components are part of the same high voltage network: HV Transformer HV Diode HV Capacitor Magnetron Thermal Cut-Out Any one of these components could have also been damaged. I DO NOT recommend taking any voltage measurements inside the HV network. Potentials of over 4000 volts can be reached and make it very dangerous for the do-it-yourselfer. Taking resistance readings with the unit unplugged is strongly encouraged. If you decide to pursue a repair, inspect the magnetron tip and inside of the waveguide first. If the magnetron is melted and/or there are burn marks inside the waveguide, a new microwave may be a in order. This actually may be a better option than an expensive repair. I hope you find this advice helpful.

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It sounds perfectly normal. A microwave generally draws about 13 amps or more when cooking at full power. That's a considerable amount. This current draw will actually "load down" the power line, resulting in a small but measurable drop in the voltage. The decreased voltage means the light will be dimmer and the motors for the fan and turntable will run a bit slower. BUT if you ever have _chronic_ flickering, dimming or brightening lights in your home, it could be the result of a bad connection on the neutral, etc., which can lead to a very dangerous condition. Once in a while is okay, but if it happens a lot, your landlord or electric company should examine the lines.

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