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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM secondary safety control for the ADVC80703BXAA furnace and compatible Goodman/Amana models. Working alongside the primary high-limit, this auxiliary switch guards a specific zone — typically the blower compartment or a secondary heat-exchanger area — and interrupts the burner circuit if that region overheats. The light blue color code marks its dedicated temperature rating; always match the color and part number to preserve the intended safety margin.
As a calibrated safety device, this auxiliary limit must trip at its factory-set temperature. The OEM light-blue switch ensures the correct setpoint and terminal layout. Substituting a generic switch risks nuisance shutdowns or reduced overheat protection — OEM is the safe choice.
Easy. Two mounting screws and two spade terminals. Disconnect power, photograph the wiring, replace, and reconnect. About 10–15 minutes. Verify blower operation and airflow after installation.