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The genuine OEM Goodman 10123535 is the red-button manual reset flame rollout / limit switch used on the Goodman/Amana AMS950704CXAB gas furnace and related models. Mounted on the burner bracket, it senses flame rollout and excessive temperature at the burner box and cuts the gas valve and igniter circuit to stop unsafe operation. The distinctive red button indicates a higher trip temperature than the primary limit and must be reset by hand after a fault.
OEM 10123535 uses Goodman's exact trip setpoint and bracket, which is essential for a rollout safety device — a mis-calibrated generic can trip late and allow flame rollout. Choose OEM for this life-safety component.
Easy (1/5). Disconnect power and gas first. Remove two spade terminals, unscrew the switch from the burner bracket, and reverse. About 15 minutes. Repeated tripping signals a combustion, venting, or heat-exchanger issue that needs professional diagnosis.