Microwave Stopped Heating

Microwave Repair
1

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!

3

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.

4

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.

5

Gene said:
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?

6

You can begin from reading the tech sheets posted above. It’s written very good and should give you a good start.

Gene.