Question about Microwave Ovens

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I have a Kitchenaid YKHMS147HW microwave that started turning on by itself, and will not shut off unless I unplug the unit. If I put food in to cook, the food starts cooking as soon as I plug the unit in, but the turntable does not rotate until I start a cooking cycle. So it seems as if the magnetron is running without starting any cooking cycles. A short while back I heard what sounded like a fast rattling sound like the sound of a vibrating relay as I would start a cooking cycle, but that went away, and I did notice some sparks on the top-right hand side of the microwave recently again as the unit started the cooking cycle. Has anyone else seen this type of problem. I searched every where and no one else seems to have this auto turn on type problem. Thank you.

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  • Alex Oct 15, 2013

    Thank you Jerry. Since I do not see any relays shown in the parts manual, would the relay be a part of the PCB Assembly P/N 8169526?

  • Jerry Naidoo Oct 16, 2013

    Yes, If you could send me picture of the PCB I would point out the relay to you

  • Alex Apr 15, 2014

    Jerry, I did not realize you added a comment. It is interesting but the microwave seemed to have fixed itself. It no longer runs on it's own. We had just let it stand for a while unplugged, and when I plugged it back in, it was as if nothing had happened. In the end, I just replaced the microwave. I will be taking the unit apart and will report back if I find anything unusual. Thank you for your help. Alex

  • Alex Apr 16, 2014

    Jerry, You are correct. When I took apart the microwave, the tall relay had a wire that looked like it turned brown. When I took apart the relay, the contacts were heavily blackened, so they were obviously arching. Thank you.

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Sounds like stuck relay contacts. Magnetrons need a high voltage source which is controlled by a micro to relay and then from relay to voltage source. Even the turntable works via a relay.

Posted on Oct 15, 2013

  • Jerry Naidoo Apr 15, 2014

    Sounds just like carbon build up to me

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4 Suggested Answers

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Posted on Jan 02, 2017

  • 833 Answers

SOURCE: microwave ovens

The cover is probably the magenetron. That is where the microwaves come from. If the bread was moist, it might have left condensate in the unit which is causing the sparking. Unplug the unit, leave the door open over night. If you can remove that cover, do so. Be sure to carefully replace it before using the unit. Never turn on a microwave with nothing in it.

Posted on Dec 17, 2007

MicrowaveSvc
  • 9047 Answers

SOURCE: Shuts itself off mid cooking cycle -- as if unplugged; then after 5 minutes or so turns itself back on as if it was just plugged in (forgetting all previous settings)

If you just put the fan blade back on, it will almost certainly fall off again.

The best bet is to slightly rough up the contact area of the shaft with sandpaper and use a little super glue to hold the blade assembly on the shaft, and let it set a few minutes before using it.

I always recommend that you use the hood vent exhaust fan when cooking on the stove top to keep heat, steam, and grease out of the controls.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

d:%5cele%5crepair%5cmicrowave%5cge_hotpoint%5cmini_manual_behind_grille_small.jpgdee77f7.jpg

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

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

Feel free to contact me directly (and please remind me of your full model number from the tag on the unit) 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, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

Posted on May 23, 2009

erpaalai
  • 999 Answers

SOURCE: microwave starts running on it's own

There is a short in the cntrol board. I have seen problems arise like this from mice, spiders and other insects. Power fluctuations can also trick the control into activating. ERIC

Posted on Aug 15, 2009

Testimonial: "Thanks Eric. This was very helpful."

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This is what controls the Magnetron operation via the relay on the PCB. If the Magnetron is operational without programming it usually is the cause of the problem.

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If you just put the fan blade back on, it will almost certainly fall off again.

The best bet is to slightly rough up the contact area of the shaft with sandpaper and use a little super glue to hold the blade assembly on the shaft, and let it set a few minutes before using it.

I always recommend that you use the hood vent exhaust fan when cooking on the stove top to keep heat, steam, and grease out of the controls.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

d:%5cele%5crepair%5cmicrowave%5cge_hotpoint%5cmini_manual_behind_grille_small.jpgdee77f7.jpg

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

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

Feel free to contact me directly (and please remind me of your full model number from the tag on the unit) 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, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

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