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Question about KitchenAid KHMS155LSS 1000 Watts Microwave Oven

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Constant Humm / Buzz but Works OK

After just a few hours of operation, we started to notice a faint humming/buzzing sound. It is a little louder when you open the door. Seems to be coming from the left side. All microwave functions seem to work AOK. Cooks fine too, but the high pitch is too much to bare. I tested the H.V. Diode and it checks out OK. Thanks!

Posted by Ronnie Pinkerton on

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  • Ronnie Pinkerton Dec 22, 2006

    Turned out to be the L.V. Transformer. Replaced for $50...

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William Miller

William Miller

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  • 9,179 Answers

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?

Posted on Dec 22, 2006

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Hello, i own a 7year old advantium oven everything works except the microwave, the key pad and timer shows its on but wont heat. any suggestions thanks
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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 of what a microwave should sound like when the cooling fan and high voltage section are working.

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The service manual is here.

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To allow us to help you effectively (at no charge), please post a NEW problem to FixYa, and please 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:

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(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 ###.########
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Works - but the sound has changed
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.
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