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I have a kitchen aid khms 1850 microwave. When setting idle it continues to make a small rumbling sound and after 30 minutes it smells like something is overheated. I'll unplug it after a day and will continue to hear the same rumbling sound. How do you stop the rumbling sounds?

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  • Microwave Ovens Master
  • 2,113 Answers

That is the sound of the magnetron failing. The large capacitor inside may also be drying up and causing the sound. When the capacitor dries up further it will start blowing fuses.

Posted on Nov 25, 2013

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6ya6ya
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Posted on Jan 02, 2017

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MicrowaveSvc
  • 9085 Answers

SOURCE: Burnt Rubber Smell then Off

That would most likely be a problem with the inverter or magnetron.

Due to the lethal voltages used and produced, I do not recommend that an inexperienced person work on these.

I would recommend that you contact your nearest Panasonic-authorized servicer.

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

Posted on Jul 08, 2008

MicrowaveSvc
  • 9085 Answers

SOURCE: LG Expert Microwave circa 2001

If it fails again, please reply back to this thread. Good luck!

Posted on Aug 18, 2008

  • 574 Answers

SOURCE: Kitchenaid KCMS185JSS-3 microwave - no power

Well your gonna have to take it down a take apart the microwave more than likely. Probably have a shorted HV diode,magnetron, shorted winding in HV transformer.burnt or frayed HV wire insulation

Posted on Sep 03, 2009

hiltonjug
  • 612 Answers

SOURCE: kitchen aid microwave model# khms 147 hss-1 runs but doesnt heat

Your problem is your mag tube (Magnatron) you can go to www.partsselect.com and your part number is PS2352604. Their price is $123.44. I work on micro waves myself and have found that if one isn't a built in over the stove like yours, they are not worth repairing because you can buy one cheaper. If this unit is not real old and you can replace this parts yourself it might be worth fixing bit if you are going to have it repaired, it might be cheaper to replace it. Good luck.

P.S. If you open this unit up. Make sure you bleed the capacitor off, this is one that will knock the _ _ _ out of you if you ground it by touching it. Bleed it by using screw driver to short capacitor to ground or case.
Please rate this solution

Posted on Sep 03, 2009

MicrowaveSvc
  • 9085 Answers

SOURCE: GE Advantium oven SCA 2000

The fact that it stopped during cooking, then came back on after several minutes, tells me that the magnetron probably overheated and its thermostat (called the M.G.T. T.C.O. in the service manual here) opened until it cooled back down.

An overheating magnetron can be due to:

  • operating oven without cover(s) in place
  • wrong magnetron installed in oven
  • an old or otherwise failing magnetron
  • cracked magnetron magnet
  • improper power line voltage (should be 110-125VAC)
  • foods low in moisture (popcorn & bacon, e.g. - add 1/2 cup of water in rear oven)
  • failed or inoperable cooling fan or hood vent exhaust fan
  • deteriorating foam weatherstripping seals in air ducts or on outside cover
  • blocked air vents (dust, animal nest debris, insufficient free air space behind & around oven, etc.)
  • clogged or greasy charcoal filter or grease filter
  • blocked duct in hood vent exhaust
The fact that the oven is now quieter tells me that one of the high voltage components may have failed, or the high voltage section is not getting power.

It may be as simple as a failed top door switch (see this test file) or it may be a failed high voltage component, most likely the high voltage rectifier diode or the magnetron.

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

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


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


http://www.gallawa.com/microtech/xformer.html

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

Note that the magnetron has a five-year warranty. If it's under magnetron warranty, GE will send you the magnetron to do it yourself.

If the magnetron is bad, call them at 888-239-6832 with the full model number, serial number, and date of manufacture.


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

Posted on Jan 11, 2011

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It sounds like a failing magnetron. Sometimes they can be intermittent before they finally fail for good.

Chances are your oven has a 5-10 year warranty on the magnetron.

Please note that FixYa is not currently notifying us Experts when Clarification Requests are answered.

To allow us to help you effectively (at no charge), please post a
NEW problem to FixYa, and please include your brand name and the full model number from the tag in or on the unit, and your detailed symptoms.

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.

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Your problem is your mag tube (Magnatron) you can go to www.partsselect.com and your part number is PS2352604. Their price is $123.44. I work on micro waves myself and have found that if one isn't a built in over the stove like yours, they are not worth repairing because you can buy one cheaper. If this unit is not real old and you can replace this parts yourself it might be worth fixing bit if you are going to have it repaired, it might be cheaper to replace it. Good luck.

P.S. If you open this unit up. Make sure you bleed the capacitor off, this is one that will knock the _ _ _ out of you if you ground it by touching it. Bleed it by using screw driver to short capacitor to ground or case.
Please rate this solution

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