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The Goodman 10123533 Manual Reset Limit Switch is a genuine OEM safety control designed for the AMSS960403ANAA and other Goodman/Amana 96% AFUE gas furnaces. This rollout/high-limit switch monitors for flame rollout or an overheating heat exchanger and cuts power to the gas valve when an unsafe temperature is detected, protecting your home and equipment.
Because it is a manual reset device, once tripped it must be physically reset by pressing the red button after the underlying fault (blocked flue, dirty burners, cracked heat exchanger, or restricted airflow) has been diagnosed and corrected. A switch that trips repeatedly signals a real problem that should be inspected.
OEM vs. Generic: This genuine OEM switch is calibrated to the exact trip temperature and mounting profile specified by Goodman, ensuring correct safety operation and a factory-warranty fit. Generic universal switches may differ in trip point, terminal orientation, or bracket, risking nuisance trips or improper protection. For a safety-critical component we always recommend OEM.
Install difficulty: Easy (1/5). Disconnect furnace power, unplug the two spade terminals, remove two mounting screws, and swap in the new switch. Basic hand tools only. Always confirm the root cause before returning the furnace to service.