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The Goodman 10123529 is a factory manual-reset limit switch that guards your furnace against dangerous overheating and flame rollout. Unlike an auto-reset limit, this control stays open after it trips and requires a physical button press to restore operation — a deliberate safety design that forces you to investigate the cause before the furnace restarts. It is a direct OEM replacement for the ADVC80805CXAA furnace.
The OEM 10123529 uses Goodman's exact trip temperature and mounting footprint, so the safety circuit behaves as engineered. Generic switches can carry the wrong trip point or a bracket that positions the sensing element incorrectly, undermining protection. For a life-safety part, always choose genuine OEM.
A 10–15 minute repair. Disconnect power and gas, photograph the two wires, remove the mounting screws, and install the new switch in the same location and orientation. Press the reset button and restore power. Important: repeated tripping signals a real problem — check blower operation, airflow, and for a cracked heat exchanger or burner rollout before returning the unit to service.
Genuine Goodman part, shipped fast from NationalHVACParts.com.