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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control engineered for the AMH80704BXCA gas furnace and other compatible Goodman and Amana 80% models. This normally-closed thermal switch opens the circuit and shuts down the burners if it detects abnormal heat or flame rollout at the burner box, protecting your furnace and home from overheating. Because it is a manual reset design, it must be physically reset with the red button after a trip — a deliberate feature that ensures a technician inspects the unit before it fires again.
The genuine OEM 10123529 is calibrated to the exact trip temperature specified by Goodman, guaranteeing the burner shuts off at the correct threshold and preserving your equipment warranty. Lower-cost generic switches may use loose temperature tolerances that nuisance-trip or, worse, fail to trip — a serious safety risk on a gas appliance. For a life-safety component, we recommend the OEM part.
Easy (2/5). Turn off power and gas, unplug the two spade terminals, remove the mounting screws, and install the replacement in the same orientation. Most homeowners complete this in 10–15 minutes with a nut driver. If the switch trips repeatedly after replacement, have the heat exchanger and venting inspected by a licensed HVAC professional.