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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-temperature safety control for the WGFM28070V4BXAB gas furnace. This switch monitors heat-exchanger or burner-compartment temperature and cuts the gas valve if the furnace overheats — protecting against cracked heat exchangers and fire hazards. Because it is a manual-reset device, a tripped switch must be pressed to restore operation, alerting you that an overheating condition occurred and needs diagnosis.
The genuine Goodman OEM switch is calibrated to the exact trip temperature the furnace was engineered for. Generic switches with a different setpoint can nuisance-trip or, worse, fail to trip when they should — defeating the safety function. On a life-safety control, never compromise: use the OEM-spec part.
Easy to Moderate (2/5). Involves disconnecting two wire terminals, unbolting the old switch from its bracket, and mounting the new one in the same location. Simple mechanically, but because it is a safety device, have a technician confirm why it tripped before returning the furnace to service. Cut power and gas first.