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I have a Kenmore microwave model 721 62463201. When I try to use it an intermittent loud buzzing noise with "sparks" emit from behind the silver panel inside. Sometimes times there is a burning smell afterward. It helps to cover food with a plastic cover or to turn it off and on again.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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MicrowaveSvc
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SOURCE: KENMORE MICROWAVE (HOUSEHOLD) LOCKED

It sounds like you press STOP two or three times to lock it. Maybe that (or another key) will unlock it.

The lock / unlock procedure will be covered in your owner's manual.

Or you can try a hard reset - unplug it from the wall for one minute, then plug it back in and try again.

If you don't have your manual, you can get one here. (Enter your model number without any spaces)

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

Posted on Jul 01, 2008

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breddi2
  • 126 Answers

SOURCE: plastic melted inside oven, dripping from ceiling Kenmore 721

The round peice in top of unit is a cover for the stirrer wich moves waves around for even cooking. The reason for it melting is almost certainly there is not enough paint in cavity and waves are shorting out to metal.CALL the manufacturer and depending on age of unit they may replace it free

Posted on Apr 22, 2009

  • 1 Answer

SOURCE: Kenmore 721.80524500 makes a buzzing, grinding noise

Your problem is due to the "magnetron" arcing to the wave guide within the microwave. Picture someone arc-welding stuff together inside the microwave casing, that's essentially what's happening. It is a fire hazard and you should stop using the microwave immediately. As far as I know, there isn't a recall on that particular model (though there was on another similar Kenmore/Whirlpool model) so if it's out of warranty, you're out of luck.

Posted on May 01, 2009

  • 4090 Answers

SOURCE: ge spacemaker microwave JVM1330BW002 making noise, food not warm

bad news I am afraid. the heart of the unit has had a coronary and needs a tech to intervene

Posted on Aug 01, 2009

heatman101
  • 43501 Answers

SOURCE: microwave smokes and smells like burning plastic

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

Microwave Oven Basic Troubleshooting Tips
http://www.fixya.com/support/r5508031-microwave_oven_basic_troubleshooting

heatman101

Posted on Aug 07, 2010

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see this causes and fix it. God bless you
Magnetron If the microwave is loud or noisy only when cooking, the magnetron tube might be defective. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. Under normal circumstances the magnetron is nearly silent. However if it is damaged or nearly burned out it can begin emitting high pitched or growling noises. It's not normally dangerous to use a microwave oven when it makes these noises, but they are an indication that the magnetron is almost dead and will need to be replaced.
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Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

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There's no heat, but it buzzes loudly When the microwave won't heat, but you hear a loud buzz, you usually have a defective power diode, high-voltage capacitor, or magnetron. I recommend that you consult with a qualified appliance repair technician for help in determining the problem and deciding what to do about it.
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