Determining whether the primary ceramic high-voltage or line fuse inside a residential microwave oven has blown involves performing a continuity test with a digital multimeter. First, unplug the microwave from the wall outlet and wait several minutes for high-voltage capacitors to discharge safely. Second, remove the outer metal cabinet housing and locate the fuse holder near the power cord entry or transformer. Third, pull the fuse out and test it with a multimeter set to the ohms or continuity setting. You can troubleshoot microwave electrical safety easily. You can verify that your fuse is blown when the multimeter registers an open circuit (OL) with zero continuity, confirming you must replace it with an identical amp rating.
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