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The oven sparks and gives a loud hum during use with plastic food containers. This scares my wife and mom terribly. I have an Emerson 900W microwave oven (model:MW8999SB).

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It seems as though the container has a small amount of metal embedded in it ... don't assume just because it is plastic you can put it in the microwave.
Tip ... put just the plastic container in empty and try it. If the plastic get hot then it's the wrong type plastic for a microwave

Posted on Oct 02, 2009

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

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From your description it sounds like the magnetron has failed in this oven. That's the part the makes the microwaves to heat the food. It typically fails by shorting out and making a loud hum noise. It not usually worth fixing since the price of a replacement magnetron is almost as much as a new oven.

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Food will not heat everything else is working


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Our Sharp microwave oven turns on, makes a loud humming noise, starts to smell like something is burning, but doesn't heat. Well, actually, we don't think it heats, we're too scared to let it run because...


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Loud RATTLE LIKE HUMM!!


That's what they do - plenty of focused energy at work here. However, try removing the rotating food tray and, with just a glass of water in the oven (never run it empty!) see if the hum goes away. If so, it's the tray driver/carrier.

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HI. I have a Whirlpool Microwave (MH6141XKB). It will not reheat the food and makes a louder "humming" sound than normal. Other than that, everything works fine. Please advise. Brent


Brent
The magnatron in your oven has gone out and will need replaced!( This is the device that heats up your food) If everything is working and your food is not getting hot 99.9 percent of the time its the Magnatron or its fuse! The loud humming is also a big clue the MAGNATRON has gone bad!
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You either have a bad magnetron tube (5 or 10 year parts warranty item through GE Factory Service 1-800-432-2737 or www.geappliances.com) or a shorted high voltage rectifier. I think the light being out is a secondary problem.

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my guess would be the wave cover. sometimes they smoke and makes sparking sounds. does it still heat food?...if it does, then its not the magnetron.

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