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The Goodman 10123517 Manual Reset Limit Switch is a genuine OEM high-temperature safety control for Goodman GCH90703BXAB gas furnaces. This limit switch monitors heat exchanger and burner-area temperature and cuts power to the gas valve if the furnace overheats — protecting against cracked heat exchangers and unsafe operation. Its manual reset design requires a technician to physically reset it, ensuring an overheat event is never silently ignored.
Genuine Goodman limit switches are calibrated to the exact trip temperature the furnace was engineered for. Because this is a life-safety component, an incorrectly rated generic switch can trip too late (overheat risk) or too early (nuisance shutdowns). Always match the OEM temperature rating — this part is factory-correct.
Moderate (2/5). Two spade terminals and mounting screws; a multimeter is helpful to confirm continuity. Shut off power and gas first. Given the safety role, professional installation is recommended.