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The Goodman 10123517 Manual Reset Limit Switch is a genuine OEM safety control for the GCH91155DXAE gas furnace and compatible Goodman and Amana models. This high-limit switch monitors temperature at the heat exchanger and interrupts the burner circuit if the furnace overheats — a critical protection against cracked heat exchangers and fire hazards. Because it is a manual reset device, it must be pressed to restore operation after a trip, alerting the homeowner that a fault has occurred.
This OEM Goodman limit switch is calibrated to the exact trip temperature your furnace was designed around. A generic switch with the wrong setpoint can nuisance-trip or, worse, fail to trip when it should. For a safety-critical component, always fit the OEM specification.
Easy to Moderate (2 of 5). Requires disconnecting two spade terminals and removing two mounting screws. Shut off power and gas first, and verify the root cause of any high-limit trip before replacing. If the switch keeps tripping, have a licensed HVAC technician inspect airflow and the heat exchanger.