Question about KitchenAid KCMS1555RSS Stainless Steel Microwave Oven

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Stopped heating food

The other day, when microwaving food, I stopped the microwave to take the food out and did not cancel the remaining time and left the door ajar. A few minutes later , I heard a humming sound and tracked it down to the microwave running with the door ajar and the smell of a burning motor. Now it won't cook. Help!

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  • KitchenAid Master
  • 8,820 Answers

This is usually caused by either a bad door switch, a loose door switch mount (which are pretty simple problems to fix) or occasionally a problem on the control panel.

Door switch or mount trouble is usually caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.

One test that sometimes helps is to gently lift up (and/or push down) on the door or handle as you try to start it. If it works or tries to work, then it's a door switch mount or door alignment issue.

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

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

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

If you don't find yours, or if you want to look at it without disassembling the oven, you may be able to download it here.

If you only need a switch, you can order a universal type here for $5 postpaid.

If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases in about a week or so.

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

Posted on Jan 01, 2009

  • morphneo Sep 07, 2011

    My problem is similar, but the microwave only "runs" when the door is closed, but does not heat the food. Does this also sound like a bad door switch or a loose door switch mount? I have the exact same model as mentioned in the original post. Some of the links in the response seem to be outdated, but I did find the parts listing here: http://www.appliancepartspros.com/partse...

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