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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-temperature safety control for AMVM970603BNAA modulating variable-speed gas furnaces. This normally-closed switch opens the ignition/gas circuit if it senses an over-temperature or flame-rollout condition, shutting the burners down to protect the heat exchanger and prevent an unsafe operating state. Because it is a manual reset device, it will not automatically re-close — a tripped switch is your furnace telling you to investigate airflow, venting, or a cracked heat exchanger before restarting.
Safety controls are not the place to gamble on generics. This genuine OEM switch is calibrated to the exact trip temperature Goodman specifies for this heat exchanger. Off-brand switches with the wrong set point can nuisance-trip or, worse, fail to trip when they should.
Easy (DIY-friendly). Two spade terminals and one or two mounting screws — usually a 10-minute job. Turn off power and gas, note wire positions, and confirm the underlying fault is corrected before resetting.