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The Goodman 10123529 Manual Reset Limit Switch is the genuine OEM high-temperature safety control for the AMS80804BXAD furnace. This normally-closed switch continuously monitors heat-exchanger and cabinet temperature; if the furnace overheats — usually from restricted airflow, a dirty filter, or blower failure — it opens the circuit and shuts off the gas valve to prevent damage or fire. Because it is a manual-reset design, it must be pressed to restore operation, alerting the homeowner that a real overheat event occurred.
The OEM 10123529 is calibrated to the exact trip and reset temperatures Goodman engineered for this furnace. A generic switch with a different setpoint can trip too early (nuisance lockouts) or too late (unsafe). For a safety-critical component, matching the factory OEM part is strongly recommended.
Easy (1/5). Disconnect power, unplug the two spade terminals, remove the mounting screws, and install the new switch in the same orientation. Reconnect and test. A 15-minute repair. If it trips again after reset, diagnose the airflow root cause.