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The Goodman 10123529 is a genuine OEM manual reset limit switch (flame rollout / high-limit safety) for the Goodman/Amana AMH80604BNBB gas furnace. This normally-closed thermal switch opens the ignition circuit if it senses abnormal heat from flame rollout or a blocked heat exchanger, shutting the furnace down to prevent damage. Because it is a manual reset device, it must be physically reset with the push button after the underlying fault is corrected.
The OEM 10123529 is calibrated to the exact factory trip temperature for this furnace's heat exchanger design. A generic switch with the wrong set point may nuisance-trip or, worse, fail to protect against a genuine rollout condition. For a safety component, OEM calibration is strongly recommended.
Easy (2/5). Disconnect the two spade terminals, remove the mounting screws, and install the replacement. If the switch tripped, always diagnose the root cause (rollout, restricted airflow) before resetting. Shut off power and gas first.