We've got a over-range microwave that's part of our 4 appliance set, so I'm not particularly interested in replacing it. It previously had an issue where it was buzzing very loud and not heating and I replaced the magentron and that fixed that issue.
Over the weekend it started behaving the same way (loud buzzing, no heat), so I ordered a new magnetron and replaced it last night. Now the loud buzzing is gone, but still no heat. I get the hum that I assume is related to the fan activity, but the slightly louder hum that goes along with heating is missing (I'm inferring a little here - what I hear all the time now is the sound that I get when I'm running it at less than full power and it's not in the heating cycle - I never hear the sound that I used to get when running at less than full power and it was heating).
Any clues on how I should troubleshoot, what other component might be bad, and whether or not the magnetron was bad in the first place?