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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety high-limit / flame-rollout control for the Goodman GDH80403ANBA and compatible Goodman/Amana gas furnaces. This normally-closed switch opens the ignition circuit if it senses abnormal heat or flame rollout, shutting the furnace down to prevent overheating. Because it is a manual reset device, a tripped switch signals a real problem — a blocked flue, cracked heat exchanger, or restricted airflow — that should be diagnosed before resetting.
This genuine Goodman OEM switch is factory-calibrated to the exact trip temperature your furnace requires. A limit switch is a life-safety component — a generic switch with a different trip point can either nuisance-trip or, worse, fail to trip when it should. For any safety control, always install the OEM-spec part with the correct temperature rating.
Easy (1/5). Usually two mounting screws and two spade-terminal wires. Cut power at the breaker, note wire positions, and mount the new switch in the same orientation. If the switch had tripped, diagnose the root cause before returning the furnace to service.