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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control engineered for Goodman and Amana AMS81005CXAD gas furnaces. This rollout/high-limit switch monitors heat exchanger and burner temperatures, opening the circuit to shut down the furnace if a dangerous overheat or flame-rollout condition occurs. Because it is a manual-reset design, it will not auto-cycle after a fault — it forces a hand reset, prompting the homeowner or technician to investigate the root cause before the furnace can run again.
This is the factory OEM part, calibrated to the exact trip temperature your furnace was designed around. Generic aftermarket switches may carry a different set point or lead length, risking nuisance trips or delayed shutdown. For a safety-critical component, OEM is the recommended choice.
Easy (1/5). Two spade terminals and one or two mounting screws. Always disconnect power before servicing. If the switch has tripped, diagnose the overheat cause (blocked flue, dirty filter, failed blower) before resetting.