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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-temperature safety control for the ADSS800804BXAC gas furnace. This switch monitors heat-exchanger and burner-compartment temperature and cuts power to the gas valve if it detects an overheat condition — a critical safety function that guards against restricted airflow or a failed blower. The manual-reset design forces a technician to inspect the furnace before it can be restored to service.
The genuine Goodman limit switch is calibrated to the exact trip temperature specified for this furnace and uses the correct terminal and mounting pattern. Because this is a safety component, an incorrectly rated generic switch can trip too early — causing nuisance lockouts — or too late, defeating the protection. Always use the OEM-spec switch for safety-critical controls.
Moderate (3/5). Disconnect power and gas, remove the two mounting screws, transfer the wire leads to the new switch, and reinstall. Verify correct trip/reset operation after install. Recommended for a qualified HVAC technician on safety controls.