Question about KitchenAid KHMC1857WSS Microwave Oven

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Kitchenaid Microwave KHMC1857WSS won't heat until after 1 minute

I have a 2 year old Kitchenaid Microwave/Convection oven model #KHMC1857WSS that has developed a strange problem when using the microwave function. When set to 100% power the microwave does not start heating until after a full minute passes. At 61 seconds an internal relay clicks, the fan slows very slightly and it starts heating normally. It will also heat OK at 90% power. I've checked the voltage at the wall plug and it's fine, even under load. I've done some research on various sites and found solutions posted saying that the magnetron is energized by the control board and that only the control board could cause a problem of this type. I ordered a new control board and after replacing it the microwave has exactly the same problem. If not what else can cause this problem?

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  • Steve Spade Jan 16, 2013

    This is a duplicate. The Fixya site did not allow me to sign in because of a password error. I was unable ro get the site to send me a password reminder. When I created a new account and posted the problem again I found this.

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SOURCE: KitchenAid Architect II KHHC2090S Stainless

Perhaps the "repairman" should take another look at it. A lot of microwave ovens have an aerial that directs the energy out to the load or food to be heated.
Maybe...maybe not but worth a look behind the waveguide cover I would say.

Posted on Mar 24, 2011

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