Determining whether the primary thermal line fuse or high-voltage fuse inside a microwave has blown requires a continuity test with a digital multimeter. First, unplug the microwave and wait several minutes for high-voltage capacitors to discharge. Second, remove the outer metal cabinet housing and locate the fuse. Third, pull the fuse from its holder and test it with a multimeter set to ohms. You can troubleshoot electrical faults safely. You can verify that your fuse is blown when the multimeter registers an open circuit (OL) with zero continuity, confirming that electrical current cannot pass through and you must replace the blown fuse with an exact match.
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