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The Goodman B1497204 Fusible Link is a genuine OEM 144°C (291°F) one-time thermal safety fuse for the Goodman GUP040-2 gas furnace. Wired in series with the control circuit, it permanently opens if the blower compartment or wiring reaches an unsafe temperature — for example after a blower or motor failure — cutting power to prevent overheating. Because it is a sacrificial, non-resetting device, a blown link means no heat until it is replaced, and it usually points to an underlying overheat condition worth investigating.
The OEM B1497204 opens at exactly 144°C, the temperature Goodman engineered for this cabinet. Generic links rated at a different temperature either nuisance-trip on normal cycles or, worse, fail to open when they should — defeating a safety function. For a safety device we strongly recommend the genuine OEM link.
Inexpensive, quick repair: disconnect power, unplug the two terminals, and clip the link into place. About 10 minutes. Important: if the link blew, diagnose and correct the cause of the overheat (failed blower, restricted airflow, or bad motor) before returning the furnace to service.