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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-temperature safety control for AMVC80604BXAA two-stage variable-speed gas furnaces and compatible Goodman/Amana models. This manual-reset switch (commonly a flame-rollout or auxiliary high-limit control) opens the gas/ignition circuit if it senses abnormal heat, protecting against flame rollout, blocked flue, or heat-exchanger problems. Because it is manual reset, it will not automatically reclose — a tripped switch signals a condition that should be inspected before resetting.
OEM vs. Generic: Limit switches are calibrated to a specific trip temperature and mounting footprint. A generic switch with the wrong set point can nuisance-trip or, worse, fail to trip when it should — a serious safety risk on a combustion appliance. The genuine 10123529 carries the factory-correct temperature rating and terminal layout, so it protects exactly as designed. For any safety limit, OEM is strongly recommended.
Install difficulty: Easy (1/5). Turn off power and gas, note wire positions, unbolt the old switch, and mount the new one with the same orientation. Push-on terminals — no soldering. If the switch had tripped, diagnose the underlying cause (rollout, restricted venting, cracked heat exchanger) before returning the furnace to service.