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The genuine OEM Goodman 10123529 is a manual-reset high-limit / rollout safety switch for the AMH80904BXCC gas furnace. This normally-closed thermal switch opens and shuts down the burners if it senses excessive heat or flame rollout in the burner compartment, then stays open until a technician presses the reset button — preventing repeat overheating until the root cause is corrected.
Because this is a life-safety component, the trip temperature and mounting must match the furnace exactly. Genuine Goodman switches are calibrated to the AMH80904BXCC's certified limit setpoint; generic substitutes with the wrong open temperature can nuisance-trip or, worse, fail to protect against a real overheat. Always use OEM for safety switches.
Easy (DIY-friendly, 10–15 min). Kill power, disconnect the two spade terminals, unscrew the switch, mount the new one, reconnect, and press reset. If it trips again after reset, diagnose airflow or flame rollout before running the furnace.