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The Goodman 0130F00038 Auxiliary Limit Switch is the genuine OEM secondary safety control for the ACEC800804BXAB and compatible Goodman/Amana furnaces. The light-blue color code marks its specific factory trip temperature. As an auxiliary (secondary) limit, it backs up the main high-limit by monitoring a separate zone of the heat exchanger or blower compartment, opening the circuit to shut down the burners if a localized over-temperature condition develops.
OEM vs. Generic: The light-blue code corresponds to an exact cutout temperature — installing the genuine 0130F00038 ensures the auxiliary limit trips precisely as designed. Generic substitutes with mismatched ratings can cause nuisance shutdowns or miss a real fault. The OEM part keeps this safety layer accurate.
Install Difficulty: Easy — two screws and two push-on terminals, about 15–20 minutes. Confirm the light-blue color code matches before installing. Always shut off gas and power before servicing.