My Kenmore Elite microwave (countertop model) is making a high pitched humm or buzz, almost can't hear it at all. It's louder when you open the door. It works just fine except the sound. We unplugged it for now. Any suggestions?
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Re: High pitched hum/buzz
By high-pitched, you mean it is not that same frequency as when it's cooking?
Is the tone near or the same as the beep you hear when you press a key?
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include your brand name and the full model number from the tag in or on
the unit, your symptoms, as well as the answers to these questions: - When you try to microwave are the inside light, internal cooling fan and turntable all working?
- Is there any unusual noise or is it louder or quieter than normal?
(A loud buzz, hum, or groan is usually a
shorted high voltage rectifier diode, but a sound like gurgling into an
empty coffee mug is one symptom of a failed magnetron, and yet the mag can
be bad without that sound.) We have a sound clip here of what a microwave should sound like when the cooling fan and high voltage section are working.
Note that a full
Sears/Kenmore model number has 3 digits, a dot, then 8 more digits,
such as ###.########
Probably a bad mag, if the transformer goes bad it will draw a lot of amps and blow the fuse. If a mag shorts it just makes a more pronounced hum. Same with the rectifier. If you Ohm out the rectifier it should show open both ways as it is a really high resistance and the only way it would make a louder hum is if it shouts. so If it looks open it is probably OK, and probably bad mag. .
Possibly, the "fault" was the buzzing in the first place! Buzzing is usually a cabinet vibration caused by magnetic fields from the "gubbins". If the buzzing should occur again, try pushing/ pulling/ poking the cabinet while the oven is running, you may find a position that causes the buzz to stop.
Another possibility is you previously had something else placed in close proximity to the oven.
If a rattling cabinet is the problem, either try to reposition something, or just ignore it!
The "HUMM" indicates a breakdown in the High Voltage Side. The loud "POP" was the breakdown. You have only four Components in the High Voltage side.
1. High Voltage Transformer. You can eliminate this as the problem. Why? If it was the problem it would have blown the line fuse, and would have given off a burned transformer smell.
2. High Voltage Diode. Usually will Burn or Pop when shorted, but will then OPEN the Circuit and there is no "HUMM".
3. High Voltage Capacitor.This is the Silver Can with the two terminals on top. It can SHORT internaly between the plates (the two terminals) and give the "HUMM".
4. Magnetron. This is my number one suspect. A SHORTED Magnetron.
The magnatron is shorting and overloading the high voltage transformer
which is complaining with a load noise. Worth fixing if you do it
your self. Magnatrons cast about $40 wholesale. There are
just a few varieties of them that fit almos all brands. Try
I was going to suggest the low voltage transformer, but when you said it sounded like it was coming from the left side, that seemed odd.
I have a stock transformer here I keep for test that is loud, but it works. Odd, eh?