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The Goodman 0130F00038 Auxiliary Limit Switch (identified by its light blue body) is a genuine OEM secondary safety control for the AMS80403AXAC 80% AFUE gas furnace and related Goodman and Amana models. This manual- or auto-reset thermal switch provides backup overheat protection — typically guarding against flame rollout or excessive temperature at a specific point in the cabinet — and cuts the gas valve circuit before conditions become unsafe.
The light-blue color denotes an exact trip temperature — installing the wrong-rated switch defeats the safety it's meant to provide. This genuine Goodman OEM part guarantees the correct temperature calibration, reset type, and terminal fit. Generic substitutes with mismatched ratings are a real safety risk on this component, so OEM is strongly recommended.
Easy (1/5). Disconnect power, note the wire positions, remove the mounting screw(s), unplug the spade terminals, and install the new switch in the same location and orientation. Under 15 minutes with a nut driver. If this switch tripped, investigate the underlying cause (blocked flue, dirty burners) before returning to service.
Genuine OEM safety control, in stock and shipping fast.