Question about Emerson MW8168B Microwave Oven

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My microwave turns on but we can't get any heat on any power levels It makes the normal sounds but no warming.

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We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are operating here.

A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.

If there's no unusual noise, it may just be a bad connection at the magnetron.

Here are some links you or someone you know can use (in order given) for high voltage section test help, but read the safety warnings first:


http://www.gallawa.com/microtech/diode.html
(if it is NOT shorted or burned looking, it's probably fine)


http://www.gallawa.com/microtech/mag_test.html
(continuity can be good even though mag is bad!)


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

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

Many Emerson microwave owner's manuals are available for free download here.

Even though yours may not be there, there might be one close enough to help you .

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

Posted on Dec 13, 2009

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Temperature at 10 power level


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The power level by itself won't give you an indication of the temperature because you need to know the time that the power has been applied. In simple terms Energy =time*power. The temperature reached is somewhat proportional to the energy, that makes it dependent on the time and the power.

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From your description it sounds like the magnetron is failing, or the high voltage transformer is not putting enough high voltage to properly drive the magnetron, the other possibility is the solid state triac is not working properly, normally if it becomes defective the power level stays on one only, but you stated even at full power it was only defrosting, so it would seem the triac is working but maybe not they way it should. The cost for parts and labor could be close to the price of a new unit depending on the nature of the repair.

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WHAT IS WRONG WITH YOUR MICROWAVE?

small_6_37.jpg For a detailed Microwave illustration, click below.

redarrow.gif Counter top
redarrow.gif Built in
Danger! You can receive a serious electrical shock from the components inside your microwave oven--even when it's unplugged. Only a qualified appliance repair technician should perform any repair.

It doesn't work at all
It sounds normal, but there's no heat
I can't adjust the power level
The carousel won't turn
I have intermittent cooking problems
The display flickers
There's no heat, but it buzzes loudly
It quit after I slammed the door
It looks like there's lightning (arcing) inside my microwave

hope this may help;

Regards,
VOTIT

DON'T FORGET TO RATE;

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That's how it would sound if you were cooking on a power level less than full power.

If you enter the cooking time and hit Start, it should cook at full power by default and not cycle like you describe.

If you are using some sensor cook setting or automatic type cooking setting, it may cycle like that normally.

The first thing to try is a "hard reset". Unplug it from the power line for a minute, plug it back in, set the clock, then try again.

Let us know if the hard reset doesn't fix it.

If you don't have your manual, you can download it free here. Check the lower right area to enter your model. number.

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

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Have you tried putting a cup of water in it and cooking on a low power level? If it buzzes only when it is on the cook cycle, that would narrow it down. More detals might help us help you, including the model number.

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