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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control for the Amana/Goodman AMH80905CXCA 80% AFUE gas furnace. This normally-closed rollout/high-limit switch monitors for flame rollout or excessive temperature at the burner box and cuts power to the gas valve if an unsafe condition is detected. Because it is a manual reset device, it must be pressed to restore operation once the fault is cleared — a design that forces inspection before the furnace can restart.
The genuine 10123529 is calibrated to Goodman's exact trip temperature. A generic switch with the wrong setpoint may nuisance-trip or, worse, fail to open when it should — defeating a critical safety function. For any combustion safety component, OEM is the only responsible choice.
Rated 2 of 5. Remove two mounting screws, transfer the spade connectors, and mount the new switch. A repeated tripping switch usually signals an underlying airflow or combustion problem that should be diagnosed. Shut off gas and power before servicing.
Genuine OEM Goodman part. Verify your furnace model and switch temperature rating before ordering.