Determining whether a thermal line fuse or electrical fuse protecting a range hood or appliance fan has blown involves performing a continuity test with a digital multimeter. First, disconnect power to the appliance by unplugging the unit or switching off the circuit breaker to ensure complete electrical safety. Second, remove the outer housing panels to locate the fuse holder and extract the fuse. Third, set your digital multimeter to the ohms or continuity setting and place the test probes across the ends of the fuse. 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 filament has melted and the fuse must be replaced.
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