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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM high-limit safety control for the Goodman ACSS920804CNAA gas furnace and compatible models. The light-blue color code identifies its trip temperature. This auxiliary limit provides a secondary layer of over-temperature protection — commonly mounted near the blower compartment or heat exchanger to shut down the furnace if airflow is restricted or temperatures climb beyond the design window.
Color-coded limit switches are calibrated to a precise cut-out temperature. Always match the light-blue code with a genuine Goodman OEM replacement so the auxiliary limit trips exactly where your furnace's engineering intends. A mismatched switch risks nuisance shutdowns or inadequate overheat protection.
Easy (DIY-friendly). Disconnect power, unscrew the bracket, move the spade terminals to the new switch, and reinstall in the same position. About 10–15 minutes with basic tools. Investigate any airflow restriction before returning the furnace to service.