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The genuine Goodman 10123539 manual reset limit switch is a factory OEM high-temperature safety control for the AMVC960603BNBA modulating gas furnace and compatible Goodman/Amana models. This normally-closed thermal switch opens and cuts the gas valve/ignition circuit if the furnace overheats or a flame rollout is detected, protecting the heat exchanger and cabinet. Because it is a manual reset device, it must be physically reset after a trip — a deliberate safety design that forces inspection before the unit can restart.
The OEM Goodman switch is factory-calibrated to the precise trip temperature for this furnace's heat exchanger. A generic limit switch with a different setpoint can nuisance-trip or, worse, fail to protect the unit. For a life-safety control, OEM calibration is strongly recommended.
Moderate (2/5) — remove two mounting screws and transfer the spade connectors. Shut off gas and power first; a persistently tripping limit indicates an underlying airflow or venting fault that must be diagnosed.