So I bought a new microwave a few months ago and now it's buzzing pretty loud when I first start it (Gets quieter if it runs a while). It still heats as good as it ever did but I'm afraid it's the magnetron dying. Does this mean it's probably going to fry soon or something? Or is it possible that's just the way this oven is?
Does it sound like an electric hum sort of buzz vs. a rattling/vibrating sort of buzz? Could be something as simple as vibration from the cooling fan causing some static parts to vibrate against each other resulting in the buzzing sound.
Well, It's a stainless unit so I thought maybe it could be cabinet vibration but it makes no difference if I put my hand on it. If I look into the back grille when it's running, the noise sounds like it's coming from the approximate location of the fan but I think the magnetron is right in front of the fan. I would suppose it's somewhere between a loud electronic hum and a light mechanical vibration/buzz. I think it always kind of sounded a little loud but it suddenly got a lot louder about a week ago. Edited by - randomprecision on 7/23/2009 12:40:51 AM
I don't think the fan is hitting anything. I can see the fan and I can tell it's spinning at normal speed. Anyway, the noise sounds more like a loud fluorescent light ballast.
^This might seem like a dumb question since I assume you must have a good reason for not doing it, but why haven't you taken it back and see if another one of the same model does the same thing? If it were me and after taking it back to try a second one and it made the same noise again, I would take it back and get something different. As far as I know, no microwave oven should make the kind of noise you describe.
The magnetron might be loose. You can test for microwave leakage with any 802.11b/g setup. The microwave oven uses almost the same frequency as 802.11b/g wireless. See if the wireless works as well next to the over when the oven is on as when the oven is off. No interference does *not* mean no leakage but interference is worth looking at.