How To Fix A Microwave That Won T Heat Up. Please make sure the Timer function was not inadvertently used. Use a damp cloth to wipe the door and frame of the microwave.
Disconnect the thermal fuse wires unscrew the mounting screws and remove the old thermal fuse. If the diode burns out the magnetron wont receive enough voltage to operate preventing the microwave from heating. Dont panic and go buy a new microwave.
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A new and better video update for the previous one where i explain how to fix your microwave that works but doesnt heat. Check the Controls Check the Power Should the interior be cleaned Check for error or display codes Microwave troubleshooting Watch later Watch on Check the Controls. If the magnetron burns out the microwave wont heat. Locate and remove your high voltage diode to test it for continuity.
