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The Goodman 10123529 is a genuine OEM manual-reset limit (rollout) switch built for AMS80805CXAA gas furnaces and related Goodman/Amana models. This normally-closed thermal safety switch monitors the burner box for flame rollout or overheating. If it senses excessive heat, it opens the control circuit and shuts down the furnace — and because it is manual reset, it stays open until you press the button, forcing an inspection before the unit can restart.
The genuine OEM 10123529 is calibrated to Goodman's exact trip temperature and uses the correct terminal spacing and bracket. Generic switches may trip at a different setpoint, causing nuisance shutdowns or, worse, failing to protect the heat exchanger. For a safety control, the OEM part is strongly recommended.
Difficulty: Easy. Shut off power and gas, disconnect the two spade terminals, remove the mounting screws, and install the new switch — usually 15–25 minutes. If the old switch had tripped, always find and correct the root cause (blocked flue, dirty burners, weak inducer) before returning the furnace to service.