Question about Kenmore 62642 / 62644 / 62649 Microwave Oven

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Vibrating noise when cooking

Microwave is making a very loud vibrating sound - only when cooking. It doesn't make the sound every time we use it, probably 70% of the time. Also, the vibrating sound starts and stops for various amounts of time while cooking - it isn't conistent.

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  • Anonymous Dec 22, 2007

    We have the same problem. Builder installed new microwave, but it is terribly noisy, and the noice seems to cycle on and off like an exhasust fan. We had Sears serviceman come out and he said it was "normal". This is the noisiest microwave we've ever had, and if this is "normal" we want our GE microwave back!!

  • melpen Dec 29, 2007

    We have a GE Spacemaker XL 1400 microwave. It is about 5-6 years old. It worked fine until I cooked bacon in it one day and there was a loud pop. Then microwave started this very loud vibrating sound and does it every time we cook in it. The noise started about 3 years ago and since microwave was only 2 yrs., we put up with it. Now, I'm getting tired of noise and appreciate other peoples quiet microwaves when we go to other homes. Appliance still heats food great - just horrible noise. I'm worried about paying a repairman to come out and tell me to just get a new one. What should I do and can noise be fixed if appliance is still heating ok?

  • ufg8torzr1 Apr 14, 2008

    GE SPACEMAKER XL1850 - Just started vibrating when turned on. I do not know what to do ? The Microwave is about 5 years old

  • vivalfuego May 21, 2008

    Mine is a Frigidaire and does something similar....only when it's in "Cook On" mode, the first 3-5 seconds makes this very loud buzzing vibrationy noise, which then subsides and it sounds and cooks normal. Is this a safety concern?

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In order to try to set your mind at ease I will have to explain the Basics on how a Microwave Oven Functions.
When a Microwave Oven is set to COOK ...START. It cooks at 100%. There is no lowering of the heat as with a Range ( Cook Top) Control. So in order to do the other things such as DEFROST, WARM, or anything other than 100% COOK. A COOK ON- COOK OFF system was utilized. To DEFROST, the Microve COOKS at 100% for 30% of the TIME, then IDLES for 70% of the TIME. COOK ON 30% of the TIME, COOK OFF 70% of the TIME = DEFROST This is why you can hear the CYCLE. More power is required during the ON CYCLE, thus the lower vibration. The Vibration occurs when the High Voltage Transformer is turned ON ( COOK ON).
The VIBRATION seems to have got louder with age. This is somewhat normal as there is a vibration from the High Voltage Transformer present every time the Microwave is used. screws and other metal parts seem to get loose with this vibration. There is no solution, unless you can tighten EVERY screw, nut, and bolt in the unit.
Sorry!

Posted on Feb 03, 2008

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