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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM secondary safety control for the ADSS801005CXAA gas furnace and compatible Goodman/Amana models. This thermal switch backs up the primary limit by monitoring a specific zone—such as the blower compartment or burner box—and opens the control circuit if temperature exceeds its rated setpoint. The light-blue body color identifies its factory trip temperature. A tripped or failed auxiliary limit will prevent the furnace from heating and may indicate airflow or heat-exchanger problems.
Color-coded limit switches must match the exact trip temperature—installing the wrong setpoint (a different color) defeats the safety design and can allow overheating or cause false trips. The OEM 0130F00038 guarantees the correct light-blue calibration and mounting fit. Always match safety controls to OEM spec.
Easy — Disconnect power, unplug the spade terminals, remove the mounting screws, and install the matching light-blue replacement. About 15 minutes with a nut driver. Verify a complete heat cycle afterward.
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