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This is a common problem and the issue is that you accidentally set the microwave instead of the timer. It happens all the time. If you run the microwave without anything inside of it, it will overheating and trip the cavity thermal fuse. Unfortunately this fuse is mounted on the top of the microwave cavity so to access it you need to uninstall the entire microwave, then remove the outer shell so that you can see on the top of the cavity. There is a small dime sized device with 2 wires going to it. That is your cavity thermal fuse and it will need to be replaced to fix the issue.
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