Kitchenaid
KEMC378kss01
Microwave is not heating
It was working one minute, then minutes later it was dead. The display works, the fan works and it makes the usual buzzing sound.
I tried powering it off for 10 minutes, no change.
Any suggestions on diagnosing
I am reasonably technically competent
I read the part about the high voltage on the capacitor
Error Code (if any): None
Parts or tests already tried: None
Photos / video link:
If everything seems to be running but it isn’t heating then one of the high voltage components such as the HV Transformer, Capacitor, Diode, or Magnetron has most likely failed. You can confirm this by turning the unit off at the breaker, accessing the HV Transformer, disconnecting the Gray and Red wires from the low voltage side, stick your leads into those wires that are disconnected, powering the unit back on and attempting to run the microwave. If you are reading 120v AC then something on the high voltage side has failed. If you are not getting that voltage then check the Red wire with one lead and the other lead on a machine screw or bare metal part of the cabinet. If this has 120v AC then the secondary interlock has failed, in which case we recommend replacing all of the door switches for the microwave. If you are not getting that voltage from Red to chassis ground, either the magnetron thermostat has failed or the main control board is bad.
Thank you for that. I can do that.
Is there any way to get to these components without removing the whole oven from the cabinet. I could not see a way.
Eugene
No problem at all. Unfortunately, there is no way to access those components without uninstalling or at least partial uninstalling the oven from the wall.
Thanks again
I was afraid of that (uninstalling)
One more question, is there anywhere I could get a circuit diagram of the unit?
Eugene
Here’s the tech sheet for that model.
techsheet-8302001-reva.pdf (398.9 KB)