FIXED KEHC309JSS06 Combo unit Microwave not heating

[teke]

Model Number

KEHC309JSS06

Brand

KitchenAid

Age

More than 10 years

This is a combo unit. The microwave has stopped heating. It runs and the turntable spins, but it just doesn't heat. How can i trouble shoot? I ve read a diode may be of issue or a magnatron. Can you help be trobleshoot this issue

Additional information. Oven heats fine, also the convection function of the microwave works fine (it heats)

 

[Jake]

I can see if @Wx4usa can help you, he's very good with microwave's.

 

[Wx4usa]

If the turntable spins, fan runs, interior light comes on when you attempt to cook, just no heat… you can rule out these parts:
20amp fuse, 15amp fuse, primary switch, cavity thermal fuse, secondary switch, monitor switch. These are likely where the issue is: diode, magnetron or main control board. I would first check the diode and the control board. The control board should send 120v to the primary of the transformer. You can test for 120v at pin 8-2 and the secondary switch when set to cook. If you get 120v, then the issue is in the HV high voltage section which is diode, magnetron, capacitor or wiring. Could also be the magnetron thermal fuse but it I resettable. These are pretty complex microwave ovens. Might be good to call a local expert.

 

[teke]

Hi found 2 fuses both were blown the fat busman 20amp fuse and then a 20 amp fuse located near the capcitor. I do not see a 15 amp fuse. where would this be located

I have all the parts you mentioned, a diode, capacitor and the magnetron. The thermal fuse tested out fine.

Trying to figure out how to remove the magnatron....are there any videos on how to do this?

 

[Wx4usa]

I don’t see a specific video for your model. The video below may help, but try replacing just the capacitor and diode first. These two parts may be the cause of blown fuses. Be sure to unplug the microwave and discharge the capacitor.

 

[teke]

Fixed!!! So here is the update. Replaced door switches, diode, capacitor, magnetron, 20amp fuse and then the 30 amp fuse.

Microwave working again. Seems to heat food up quicker.

Thank you for your guidance

Kevin

 

[Wx4usa]

Awesome Kevin. Thanks for letting us know.