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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue color code) is a genuine OEM overtemperature safety control for the AMES800603AXAA 80% AFUE gas furnace and compatible Goodman and Amana models. Mounted near the blower or burner compartment, this auxiliary limit provides a secondary temperature cutout that de-energizes the gas valve if abnormal heat builds — for example from a blocked blower or restricted return air — backing up the primary limit control.
Goodman color-codes its auxiliary limits (light blue here) to a specific trip temperature. Installing the wrong-rated switch defeats the safety design and can allow overheating or cause nuisance shutdowns. Always match the exact OEM part number and color — the genuine 0130F00038 guarantees the correct calibration.
Easy — With gas and power off, note the wire positions, transfer the two spade connectors to the new switch, and remount in the original location. About 15 minutes. Confirm the correct light-blue part before installing, then cycle the furnace to verify normal operation and shutoff.