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The B1497204 is the genuine OEM 144°C fusible link thermal fuse for the Goodman GUE100-5 gas furnace. This one-time safety device is wired in series with the furnace control circuit and permanently opens if internal temperatures exceed its 144°C (291°F) rating — protecting the furnace and home from overheat conditions caused by blocked airflow, a failed blower, or a dirty filter. A blown fusible link presents as a completely dead furnace with no ignition sequence.
The OEM B1497204 is rated to the exact 144°C trip point specified for the GUE100-5, so it protects without nuisance tripping and meets the furnace's safety certification. Using an incorrect temperature rating defeats the safety function — always match the OEM spec. Note: a tripped link usually indicates an underlying airflow or blower problem that should be diagnosed and corrected.
Difficulty: Easy (2/5). With power off, unplug the two spade terminals and mount the new link in the same location. Inexpensive and quick — but always investigate why the original link opened before returning the furnace to service.