Whirlpool microwave not heating - magnetron?

Microwave Repair
1

Please make sure to click on General above and select the correct appliance type first.

Brand: Whirlpool
Model Number: WMH31017HS08
Main Symptom: Microwave does not heat and makes a loud buzzing noise instead.
What happens & when:

After getting help diagnosing a fridge for my in laws, he told me this morning that his 3 year old microwave stopped working. After a brief search, it seems this is a magnetron issue. That’s fine, but should I replace capacitor and diode while I am in there for this or just replace one thing and hope that’s it? I’d just like to have all the parts I might need on hand.

2

It would not be necessary to replace the diode and capacitor if they are faulty. You would just need to replace the magnetron.

3

OK. Those parts are not cheap, I will test them to make sure they are good with my MM. Thank you!!