Kenmore 66469 / 66462 / 66464 Microwave Oven Logo

Question about Kenmore 66469 / 66462 / 66464 Microwave Oven

1 Answer

High pitched hum/buzz

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?

Posted by Sandy Brill on

  • Sandy Brill Nov 29, 2006

    By high pitched I mean it's definitely a different sound than what it sounds like when it's running. When it's not running the sound is so high pitched it's barely audible unless you open the door and almost put your head inside.

    Since my first post, it is now making the noise when it runs too. It's not very loud, but certainly different from its normal sound.

    The sound may be about the same frequency as the beep, but not as loud when the machine is not running.

    My husband thinks it would cost less to replace it than to fix it. I hate to contribute to the local landfill, and would rather fix it.

  • Anonymous Mar 21, 2014

    Our Kenmore Elite 88523 buzzes very loudly with door shut. Putting a glass of ice cubes in the oven on reheat will be boiling with five seconds. It does not have the normal operating sound. Built in Malaysia, not a good thought.



1 Answer

William Miller

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Kenmore Master
  • 9,179 Answers

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? Please post a little more information so we can help better.

Posted on Nov 28, 2006


Add Your Answer


Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:


Kenmore Elite countertop microwave model 721.79153010 has no power, completely stopped working.

has an internal fuse. but you need to find out why it has blown, has it been making any funny sounds while cooking. ??

Kenmore elite microwave 79203 buzzes when off

It sounds like you have a shorted cook relay on your control circuit board.

That can usually be repaired more economically than replacing the circuit board.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Everything works exept the heat. Thought we had a power surge a few days ago?

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 ###.########

I have a Kenmore Elite over the range Microwave Model # 665.61682101 It just starting having this zapping/buzzing noise when it starts-what it it?

HI, This is a malfunctioning HV(High voltage Capacitor). It must be replaced asap. this will cause a fire in your home if not replaced soon.

Maytag CMV1000BAW microwave doesn't heat

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. .

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.
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!

Microwave no heat

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.

Kenmore 721.63662300, 1200W

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

Constant Humm / Buzz but Works OK

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?
Not finding what you are looking for?


Ask a Question

Usually answered in minutes!

Top Kenmore Microwave Ovens Experts

Jaime Hernandez

Level 3 Expert

2345 Answers

Cindy Wells

Level 3 Expert

6529 Answers


Level 3 Expert

85240 Answers

Are you a Kenmore Microwave Oven Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides