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The 10123529 is a genuine OEM manual-reset limit switch for the Goodman/Amana AMH80403ANBD gas furnace. This safety control opens the burner circuit on an overheat or flame-rollout condition and stays open until manually reset, forcing a technician to identify and correct the fault before the furnace can run again.
The OEM switch is calibrated to the AMH80403ANBD's exact trip temperature and reset behavior, which is essential for a life-safety control. Generic alternatives may trip at the wrong point or fail to latch, defeating the manual-reset protection. Never compromise on rollout safety — install OEM.
Easy (2/5). Disconnect the two leads, unscrew the bracket, and mount the replacement in about 15 minutes. If the old switch had tripped, diagnose the root cause (blocked flue, cracked heat exchanger, failed inducer) before restarting. Power and gas off before servicing.
A repeatedly tripping rollout switch signals a combustion problem — have the furnace inspected.