my microwave is all installed fine. Just when i start it the fan makes rattling sound. It stays till the entire time cycle is done and when it stops turning u can hear the fan slowly stopping with the noise rattle as if something is hitting between the fan blades.
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A microwave is not an appliance a homeowner should work on. There are lethal voltage and currents from the power transformer, and the magentron tube gives off RF radiation. If you don't know what you're doing, you can get badly hurt!