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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM flame-rollout safety control for the Goodman/Amana AMH81155CXCA gas furnace and compatible models. Mounted on the burner box, it senses flame rollout or excessive heat and permanently opens the gas-valve circuit until an operator physically presses the reset button — a deliberate safety design that forces inspection before restart.
The factory 10123529 trips at Goodman's specified temperature and holds its calibration over repeated heat cycles. Aftermarket rollout switches may trip early (nuisance lockouts) or late (unsafe). Since this device guards against flame rollout, the genuine OEM control is strongly recommended — and if it has tripped, always diagnose the root cause before resetting.
Easy (2/5). With power and gas off, remove the two mounting screws, transfer the spade wires, and reinstall. Takes about 10 minutes. After installation, press the reset button and verify normal operation.