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Microwave runs just will not heat. Changed power level still will not heat! Bought in April 2008. Have not used that much.

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  • Anonymous May 19, 2008

    sylvani microwave run but stop cooking

  • Anonymous May 22, 2008

    Same problem as tootsiepop5's, my microwave is panasonic dimension4-model NN-B706/B756, Before , I don't have problem with my microwave until recently I used the convection , now I cannot use the microwave function anymore.The microwave function works well but no heat, however the convection seems to be working well.

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  • Microwave Ovens Master
  • 8,820 Answers

Tootsiepop5 - Your unit is less than a year old, so it should be under warranty. I would contact the manufacturer for warranty service.

Guests - Generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
- loose connection at the magnetron
- problem or loose connection on the control unit circuit board
- bad magnetron or other high voltage part (such as a shorted diode)

If you or someone you know decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

We're happy to help and we appreciate your thoughtful rating of our answer.

Please feel free to contact me directly if you need more help.

William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

Posted on May 22, 2008

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1 Answer

How do i adjust power level


There are no heat levels on a microwave oven, only power levels. I am not aware of any method of checking the power level except to boil water. Boil water at each level and time how long it takes to boil. The lower the power, the longer it should take. If there are no differences in the time, the oven is not functioning as expexted.

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This sounds like the magnetron has gone, also there is a solid state device called the triac which controls the power level settings. The other two parts that can be a factor is the high voltage capacitor and diode. The repairs with parts and labor can amount to the price of a new microwave oven.

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Generally speaking, charcoal filters should be changed and grease filters should be cleaned about every six months, or whenever you notice they are getting dirty & clogged. Yours will likely have one or the other - probably not both - depending on whether it's vented or it recirculates.

A clogged filter will cause the supply of cooling air flow to be lessened, allowing the magnetron to overheat. It only takes one severe overheating to damage or destroy a magnetron.

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Magnetron's will usually have a warranty of 5-9 years, but you'd still have to pay the installation labor.

You can save a $75-90 home visit by removing the oven form the wall and taking it to a local Whirlpool-authorized warranty servicer.

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You can download Whirlpool owner's manuals and installation instructions here.

You can find helpful exploded view diagrams and order parts and accessories 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.

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The paint (or whatever it is covering the bottom)


Check the 3 wheels on the circular plastic part that's fitted below the turntable.
It sounds like they may need some filing down. Run your fingers around the wheels to see if there are any sharp bits of plastic that could be cutting into the paintwork on the base.

Clean out the base of your oven and apply a thin film of vaseline to each of the 3 wheels. This will help rotation in future.
Remember to keep cleaning out any excess food particles that may lodge below the turntable, as these will eventually slow down or stop the rotation, which in turn means that your food is not heated evenly throughout!!!

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Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

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Make sure that the power level is on high. I'm guessing you already checked that. There is a malfunction in the microprocessor, the firmware in the EPROM, The Litz Coil (high voltage high frequency) or a bad Magnetron tube. Either way, unless it is a super high end MW, it is not worth repairing unless you can do it your self. If you have a volt meter I can go through some basic troubleshooting with you when you repost. This is high voltage stuff so be careful, eye protection, rubber gloves, no jewelry.

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The first thing I would suggest is to turn off the breaker or unplug it from the wall for a few minutes to "reset" it, then try again. If a reset doesn't fix it, I would think you may have a defective magnetron. When you heat something of very low moisture content, it can lead to microwave energy not being fully absorbed, but instead being reflected back to the magnetron. This can damage it. This is usually best left to a pro to repair. In case it might help, your owner's manual can be found online at: http://products.geappliances.com/ProdContent/Dispatcher?REQUEST=SKUOBJECTS&DOCUMENT=Use%20and%20Care%20Manual&SKU=RVM1425BA

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