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The genuine Goodman 0130F00038 Auxiliary Limit Switch (light-blue body) is an OEM high-temperature safety control engineered for the Goodman/Amana ACSS960402BNAA 96% AFUE gas furnace and related models. This normally-closed thermal switch monitors heat-exchanger and cabinet temperatures, opening the 24V control circuit and shutting down the burners if the furnace overheats due to restricted airflow, a failed blower, or a clogged filter — protecting your equipment and your home.
OEM vs. Generic: This is a factory-spec OEM part calibrated to the exact trip temperature your furnace's control board expects. Aftermarket snap-discs can trip at the wrong setpoint, causing nuisance lockouts or — worse — failing to protect the heat exchanger. For a safety-critical limit switch, OEM is the recommended choice.
Install Difficulty: Easy (2/5). Replacement takes 10–15 minutes with a nut driver and a screwdriver. Always disconnect power at the furnace switch and breaker before servicing. Note the wire orientation, transfer the spade connectors, and remount with the original screws. A multimeter check for continuity at room temperature confirms a good switch.