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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue body) is a genuine OEM secondary thermal safety for the Goodman/Amana AMS81405DNBB gas furnace. Mounted near the blower deck or burner box, this auxiliary limit provides backup overheat protection — if the primary limit fails or airflow is lost, the auxiliary opens the control circuit to shut down the burners and prevent heat-exchanger damage.
The color-coded OEM 0130F00038 is factory-calibrated to a specific trip point matched to this cabinet — the light-blue coding exists precisely so it is not confused with other limits. Substituting a generic or wrong-color limit risks an incorrect cutout temperature and defeated safety protection. For safety controls, always match the OEM part and color code.
A quick two-wire replacement: disconnect power and gas, remove the mounting screws, transfer the spade connectors, and remount. No refrigerant or brazing work. After install, run a full heat cycle and confirm the furnace no longer locks out on limit. If uncertain, consult a licensed HVAC technician.