Sharp R-150 microwave made a buzz sound and shut off, no power to microwave

The cook relay on your control board is shorted, and the unit is cooking whenever you close the door.

When the magnetron overheats, its thermostat opens, shutting power down until the unit cools to a safe level, then power is restored.

I regularly repair these with my $54.95 service, which includes insured return shipping.

Details are here, or for full information and instructions, please e-mail me here at [email protected] and remind me of your full model number and symptoms.

Whirlpool Microwave Buzzing Loudly - ApplianceBlog

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Aug 12, 2011 - 10 posts - ‎2 authors
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Missy Uhland Bauman,

I understand that you are hearing a buzzing noise from your microwave, even though the door is shut and and it is not running. I would suggest to give the appliance a hard reset. You will do this by either unplugging it or cutting the power off at the circuit breaker for 3-5 minutes. After the 3-5 minutes, bring power back. If you are still hearing a buzzing sound, I suggest either contacting the manufacturer or your local authorized technician.

-Best Regards-

Someone would have to open the unit to "hear" where it is coming from, possible fan issue or even the power unit inside.

Replace it, parts are not available. Also this was not due to a setting it was due to age

Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101.

It's probably the magnetron burning up. Residential microwaves, if not under warranty, are generally considered disposible. Parts and labor are just too expensive.

You have a bad fan inside the microwave also you need to replace 10amp fuse in order to power on.

sounds Like an electrical fault in the Micro, Sorry but this is broken.... If this is within warranty (do check as some warrantys are for 3 yrs or more) get the manufacturer to replace/repair it for free. you could get it serviced, but it is probably cheaper to buy a new one.