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!

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  • Ronnie Pinkerton Dec 22, 2006

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

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  • KitchenAid Master
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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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Posted on Jan 02, 2017

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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


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 of what a microwave should sound like when the cooling fan and high voltage section are working.

If it sounds the same as usual or a little louder, I would suspect the magnetron or high voltage diode has failed.

If it is much quieter than usual I would suspect a bad upper door switch.

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:

- 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 ###.########

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WHEN THERE IS A BUZZING NOISE IT MEANS THAT ONE OF THE INTERNAL COMPONENT HAS FAILED .RANGING FROM A SMALL DIODE TO LARGE PARTS LIKE
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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. .

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