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Hi, thanks for using JustAnswer.com. Please remember, I do not get paid for my time and expertise until you accept. This indicates an issue with the high voltage components, likely the transformer. Is there any odor present, like a burning electrical smell?
Okay, well either the transformer or magnetron is causing your issue. With no smell, I suspect the magnetron. I am happy to give you repair information, but will have you read the following first so you can make an informed decision!
The U. S. Consumer Product Safety Commission (CPSC) warns against do-it-yourself repairs of microwave ovens. Each year, on average, four people die from electrocution trying to repair their microwave ovens. Microwave ovens use high voltage which makes it particularly hazardous for consumers to remove the cover and touch electrical parts. The possibility for electrical shock from a microwave oven still exists even after the oven is disconnected from the power source. Should certain internal devices fail, even unplugged ovens can cause serious injury.
The Commission strongly recommends that consumers have professionals repair microwave ovens because electrical appliances can be hazardous if consumers expose live electrical parts.
Removing the cover of your microwave oven and touching an electrical part can kill you.
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