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The Goodman 10123539 is a genuine OEM manual reset rollout limit switch engineered for the AMSS921005CNAB gas furnace and other compatible Goodman and Amana models. This safety device monitors the burner compartment for dangerous flame rollout conditions and cuts power to the gas valve if excessive heat is detected, protecting your furnace and home. Because it is a manual reset design, the switch stays open until you physically press the reset button — a deliberate feature that forces a technician to inspect the cause before the furnace can fire again.
This is a factory OEM part, matched to Goodman's exact trip temperature and mounting footprint — critical for a safety component. Generic universal switches may carry a different trip point or bracket, risking nuisance trips or unsafe operation. For rollout protection we strongly recommend OEM.
Install difficulty: Easy (⭐⭐☆☆☆). Disconnect furnace power, unplug the two spade terminals, remove the mounting screws, and swap. Typically a 10-15 minute job for a homeowner comfortable working around the burner assembly.