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The Goodman 0130F00038 Auxiliary Limit Switch (identified by its light-blue housing) is an OEM secondary over-temperature safety control for the ACEC960803BNAB 96% AFUE gas furnace and compatible models. Positioned near the blower or heat exchanger, it backs up the primary limit by cutting the burner circuit if temperatures climb beyond safe levels in its zone — added protection against restricted airflow and blower faults.
The light-blue color code indicates a specific factory trip temperature. Substituting a different color or generic limit risks the wrong cut-out point — nuisance trips or inadequate protection. Match the OEM color and part number exactly.
Easy — typically a 15-minute repair with a nut driver. Disconnect power before servicing and transfer the wiring one terminal at a time to avoid mix-ups. Professional installation is recommended if you are unsure.