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BOSCH microwave HMV8053U/01(SEPT 2018), Low hum/buzz with door closed


Premium Member
May 8, 2023
Cleveland, OH
Model Number
1-5 years
I replaced the 3 door switches and same problem. When I open the door, the buzz stops because the breaker in fuse box blows. If I attempt to reset the breaker, it blows again. Have to first unplug the microwave, reset the breaker, then plug back in. Buzz noise begins again. I can work the light, vent and start the microwave. Opening the door then causes breaker to blow.
Very often your problem is caused by 00648909 switch holder. That's the plastic piece that hold the 3 door switches. Just a slight amount of wear on the ramps where the spring-loaded door fingers rub, and you'll get your problem.
Received the new switch holder and easily installed it. Unfortunately the humm/buzz sound still occurs. The new switch holder has resolved the breaker issue but the humm/buzz still occurs. Opening the door and the humm/buzz stops, close the door and it begins again. Any ideas how to resolve or work around this?
The microwave now seems to heat things much hotter, since this buzzing symptom has begun. Example, heating water for 30 seconds now, appears to be as hot as what would previously take 90 seconds before
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@dashriprok is probably out running service calls, he should reply back soon.
Unfortunately, I don't have any microwave experience or I would help you myself. Sorry about that.
Have you identified where the buzz/hum is coming from? If not I suggest you check the platter motor. If it is rotating when the door is shut and the microwave oven is turned off then you have either a door switch problem (98% of the time) or a computer problem (2% of the time).
Have not identified the source of the buzz/hum. The platter motor is not rotating when the noise is being made. I accidentally left my digital meter inside the microwave and closed the door for 3 seconds (buzz occurs during that time), the meter got fried. I did not start the microwave during that time, just shut the door, buzz noise begins, popped the door open, the buzz noise quits and digital meter no longer works. I appreciate your help on this dashriprok
Replacing the 3 switches and the switch case resolved the breaker being tripped, guessing that some electronics (computer?) got damaged as a result of the multiple trips of the breaker??
To find noises, use a flexible rubber hose like a stethoscope. Put one end in your ear then use the free end to find the source of the noise.

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