Determining whether an internal thermal fuse or thermal limiter fuse inside a residential kitchen oven is blown requires performing an electrical continuity test with a digital multimeter. First, disconnect electrical power to the oven by turning off the dedicated circuit breaker for absolute safety. Second, remove the rear service panel or control console access cover to locate the small cylindrical thermal fuse attached to the wiring harness. Third, set your digital multimeter to the ohms resistance scale, disconnect the wire leads from the fuse terminals, and touch the meter probes directly to the fuse ends. You can troubleshoot electrical safety components safely. You can verify that your fuse is blown when the multimeter displays an infinite resistance reading (OL), indicating an open internal circuit that requires replacing the thermal fuse before the oven can operate again safely.
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