Determining whether a microwave fuse is blown involves performing a continuity test with a digital multimeter. First, unplug the microwave from the wall outlet and wait several minutes for internal high-voltage capacitors to discharge safely. Second, remove the outer metal cabinet housing to locate the fuse near the power cord entry or control relay board. Third, remove the fuse and test it with a multimeter set to the ohms setting. You can troubleshoot electrical safety easily. You can verify that your fuse is blown when the multimeter registers an open circuit (OL) with zero continuity, confirming that the internal metal filament has melted open and the fuse must be replaced.
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