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Hi~ I've searched and searched to find someone with a similar problem with the same MW and haven't had any

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Old 01-04-2009, 02:58 PM
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Default Microwave Stopped Heating
Model Number: KHHS179L   Brand: Kitchen Aid   Age: 1 - 5 years   

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Hi~ I've searched and searched to find someone with a similar problem with the same MW and haven't had any luck.

MW decided to stop heating today. It sounds almot normal and isn't throwing any error codes. It does make a slight noise that sounds like somethings trying to turn on. It just wont heat. I've tried to find the tech sheet for this model to run the test mode, but haven't had any luck. Anyone know where I can find a tech sheet and anyone have any clues as to what's going on?

Thanks!


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  #2 (permalink)  
Old 01-05-2009, 01:29 PM
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This microwave is much more complicated than a classic designed microwave. Hopefully the Tech sheets will help you to diagnose the problem and fix it.

Here are the break down diagrams for the Kitchen Aid microwave Model KHHS179LBL0

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Old 01-28-2009, 10:07 AM
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I am having the same issue with my Whirlpool, which is basically the same model as your KA. The tech sheet is behind the grill on top. Just pop off the grill, look all the way to the right, and it will be in a black little plastic sleave, folded in half and shoved in a little space. At first I thought it was part of the microwave. My micro works after the buzzing stops in about a second or so. Mine is getting close to doing what your is and not working at all. From what I can tell, this isn't a normal micro. It doesn't have the diode like everyone talks about. The HV board has some relays on it that may be causing the buzz, but I can't narrow it down to one of those. It sounds more like the magnetron area. This weekend, if I don't get any help from my post, I will take it down from the wall and see what I can figure out. I will post what I find.
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Old 01-28-2009, 01:55 PM
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Those microwaves use inverters instead of classic transformers, diode and capacitor on high voltage side. It makes the troubleshooting process more sophisticated. Having the tech sheets with the troubleshooting instructions should help your success.

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Old 01-29-2009, 04:16 AM
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Thanks Gene. That is what I pretty much figured out, and you confirmed.

I have the tech sheets and ran through most of the test. The mag past the "heat water 22 in 60 seconds" test. I ran all the relay test and each one passed without noise. I unplugged the mag and the noise was not there, but then I got an error after a few seconds. Not sure if I can conclude the mag is bad, or there was no noise due to lack of load on the inverter. I need to take the inverter out and put it on a bench and do some testing of components. Unfortunately, I don't have the prints for the inverter so I will have to "backward-engineer" the board before I can even test it. Some of these are easier than others. I'm pretty confident it is the inverter, but not 100%. I hate to spend $100 for an inverter and then find out it is the mag. Thanks for your help. I will keep you posted.
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Old 01-29-2009, 01:04 PM
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Good luck.

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Old 01-29-2009, 02:37 PM
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Quote:
Originally Posted by Gene View Post
Those microwaves use inverters instead of classic transformers, diode and capacitor on high voltage side. It makes the troubleshooting process more sophisticated. Having the tech sheets with the troubleshooting instructions should help your success.

Gene.
I learned microwave repair before the advent of the inverters. Where can I learn more about them?
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Old 01-29-2009, 02:50 PM
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You can begin from reading the tech sheets posted above. It's written very good and should give you a good start.

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