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The genuine Goodman 0130F00038 Auxiliary Limit Switch (identified by its light blue dot code) is the OEM secondary high-temperature safety for the ADVC80603BXBA furnace and compatible Goodman/Amana models. This normally-closed bimetal switch provides backup overheat protection in the blower or auxiliary zone, opening the control circuit when temperatures exceed its rated trip point. It guards against overheating from blocked returns, blower failure, or duct restriction that the primary limit may not sense.
The OEM 0130F00038 is calibrated to this furnace's auxiliary trip specification — the light blue code differs from the pink primary limit and is not interchangeable. Substituting a different trip temperature risks nuisance lockouts or lost overheat protection. Always match the OEM color; the genuine part is recommended.
Easy (2/5). Disconnect power, remove the mounting screws, transfer the spade connectors, and reinstall. Roughly a 10-minute repair. Confirm airflow and correct the root cause before restoring power.