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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-temperature safety control for the AMEH800603BXAB gas furnace. This normally-closed switch opens to shut off the burners if it senses an overheat or flame-rollout condition, and it must be manually reset by pressing its button once the fault is cleared — a deliberate design that forces the homeowner or tech to investigate the root cause before the furnace can fire again.
This genuine OEM Goodman switch is calibrated to the exact factory trip temperature for your furnace. A generic limit switch with the wrong setpoint can nuisance-trip or, worse, fail to trip when needed. Because this is a life-safety device, we strongly recommend OEM only — never substitute an untested equivalent.
Easy to Moderate — Typically two mounting screws and two spade terminals, about 15–20 minutes. Shut off power and gas before servicing. If the switch keeps tripping after replacement, stop and call a licensed technician — a persistent trip signals an airflow or heat-exchanger problem.