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The Goodman 10123529 is a genuine OEM manual reset high-limit switch engineered for the WFD18115S5CXCC gas furnace and compatible Goodman/Amana models. This safety-critical control opens the burner circuit if the heat exchanger or burner compartment exceeds its rated temperature, protecting your furnace from dangerous overheating and flame rollout. Because it is a manual reset device, it will not silently cycle after a fault — it forces a technician to inspect the cause before service resumes, exactly as the factory intended.
Our OEM Goodman switch matches the exact trip temperature and mounting footprint specified by the manufacturer — a generic substitute with the wrong trip point can nuisance-trip or, worse, fail to protect the heat exchanger. For a safety device, factory-spec calibration is not optional.
Easy (1/5) — Two mounting screws and two spade terminals. Always shut off gas and power at the disconnect before servicing. A qualified HVAC technician can complete this replacement in under 15 minutes. If the switch trips repeatedly after reset, do not bypass it — have the airflow and heat exchanger inspected.