Question about Microwave Ovens

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Makes a laud noise whenever it's turned on. Cooking okay. I worry something is wrong--it started about 2 weeks ago. I'm alone and only person using appliance. It was made March 2002 Ser. # PG 21301309

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  • annicareddis May 12, 2009

    Many thanks. It's probably a vibrating "thing", and I don't have to worry.

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  • 987 Answers

  1. Fan blades hitting support or shroud.
  2. Vibrating sheet metal.
  3. Vibrating transformer laminations.
  4. Turntable or stirrer hitting some debris.
or try this


If the noise is caused be simple vibrations, no damage is likely to result. However, if the main cooling fan is on its way out and it stops or gets stuck, parts will overheat quite quickly at which point the oven will shut down (hopefully) and there could be damage to the magnetron or other components. Therefore, at least identifying the cause is probably a good idea.
The solution may be as simple as tightening a screw or weging a shim between two pieces of vibrating sheet metal.

Posted on May 11, 2009

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So my 2 year old panasonic m/w has blown up 2 "powerboards" in 3 weeks. Turn it on and 3 seconds later there is a shorting noise and the entire thing is dead. Was told there must've been a low power


Interesting problem, I would suggest the bad power board is the result of something else. Check your outlet it may be wired wrong or with the wrong voltage.

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The exhaust fan may be loose, {check mounts} also, the turnable motor that rotates the plate often gets noisey before seizing, {remove plate to see if noise goes away} and finally the magnetron gets very loud near end of life.

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GE Over range microwave model JVM1443LK01 This started a couple days ago. After removeing something from the microwave and we shut the door, the fan started up. The fan will run as long as the door is...


I would check the door switches for a faulty switch. If it were condensation on the control panel. I would think it would have dried out by now unless it has damaged the control board.

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I have a JES1142 which I purchased only one month ago. The turning plate rotates both clockwise and counter clockwise. When it rotates counterclockwise it makes a grinding sound. Why does it rotate bot...


It's normal for the motor to turn both ways, that's because of how the motor is made. As for the grinding noise, there's no reason the motor itself would make more noise turning one direction than in the other. The noise might be coming from the roller ring under the glass turntable. One of its wheels might be binding when it tries to turn counterclockwise.

Here's a test. Take the glass tray and roller ring out of the oven. Put a microwave-safe container with a cup or so of water in the oven and start it. Stop the oven and start it again, and the motor should turn the other way. If not, repeat this until you've seen the plastic coupling turn both directions. Note whether you still hear the noise as the motor turns each way. If you do, then there is something wrong with the motor and it should be replaced. If not, the noise is coming from the roller.

In either case, if the oven is truly only a month old it's still under warranty. Since you are concerned about the noise and are worried that the oven is defective, contact the store where you purchased it and see if they will exchange it or take it in for service. If the store can't help you, refer to the owner's manual for the service procedure to follow.

Hope this helps. Thanks for using Fixya!

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No fan noise when cooking.


The internal cooling fan is critical. It comes on automatically whenever the oven is cooking.

If the oven is used without its working properly, the magnetron can be destroyed very quickly.

(This of course is different from the hood vent exhaust fan, which you can turn on and off at will)

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

In some models, the motor itself is bad. In other models, it is a bad relay or connection on the control circuit board.

We regularly repair these control panel assemblies for customers nationwide with our guaranteed $39.95 service in about a week.

Feel free to contact me directly (with your model number) for more information & help.

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

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

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the buzzing is the magnatron tube juicing too thousands of volts before emmitting the micro-wave radiation to what your cooking that turns molecules 180 degrees around... guess that friction is what really heats it.
radar ovens is what they use to call em and even people would stand in front of big ones to warm up long ago...lol canibles will love that.

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