Whirlpool micro oven combo humming

[benm5678]

Model Number

4452005

Brand

Whirlpool

Age

More than 10 years

Hi,
In a home I just moved into, I have an issue where my wallmount Whirlpool microwave/oven is humming constantly -- definitely coming from microwave & only way it stops is if I disconnect the power breaker (opening/closing door has no effect). Other observations/notes:

• It's around 20 years old/seems well maintained
• I use it to roast peanuts & in this one it takes significantly longer than others I used (6min vs 2min)
• It passed water heating test outlined in manual (heating 16oz of water for 1min raised it 40 degrees F
• Sounds normal when it runs (the humming is very quiet, so it masks it)

See video where you can hear it at rest & when I start:

I think I can manage to pull it out & reach the internals -- any idea what component to try to replace? Could it be the magnetron given the water heat test passes & only a low level hum even when not operating?

 

[Jake]

Rick @rickgburton has been out sick since Jan.12th 2022 with a serious illness, we are hoping and praying for a speedy recovery!

Rick is our Microwave expert, so unfortunately you'll have to wait for him to return or hopefully another tech. or another member that's run across this problem, can help you here.

 

[benm5678]

Thanks for update Jake. Wishing him well!!!

 

[Jake]

Thanks, he will appreciate that when he returns!