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The 10123529 is a genuine OEM Goodman manual reset limit switch, a critical safety component for the AMH80604BNAA gas furnace and compatible Goodman/Amana models. This normally-closed thermal switch opens the control circuit when it senses an over-temperature or flame-rollout condition, shutting down the furnace to prevent damage or hazard. Because it is a manual-reset design, the switch must be physically pressed to restore operation once the fault is cleared.
Safety switches are one place we always recommend the genuine OEM part. The 10123529 is calibrated to the exact trip temperature specified for this furnace. A generic switch with a different setpoint can either nuisance-trip or fail to protect against a real over-temperature condition. Never bypass or substitute an unrated switch on a safety circuit.
Rating: Easy to Moderate. Replacement involves disconnecting power, removing the two spade terminals and mounting screws, and installing the new switch in the same orientation. If the original switch tripped, always diagnose and correct the underlying cause (blocked flue, cracked heat exchanger, restricted airflow) before returning the furnace to service.