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The Goodman 0130F00038 Auxiliary Limit Switch (identified by its light-blue housing) is a genuine OEM secondary high-limit control for the AMEC961205DNAA gas furnace. Where the primary limit protects the heat-exchanger/supply-air zone, this auxiliary switch guards a secondary area of the furnace — commonly the blower compartment or a lower-cabinet location — cutting the burner circuit if temperatures in that zone climb beyond the safe threshold.
As with all Goodman limit switches, the housing color denotes a specific factory-calibrated trip temperature. The light-blue 0130F00038 is a different rating than the pink primary limit, so the two are not interchangeable — always match the color and part number to the position it protects.
Generic auxiliary limits rarely match Goodman's exact set point and mounting footprint, risking nuisance shutdowns or inadequate protection. The OEM 0130F00038 is dimensioned and calibrated for a direct, safe replacement in the AMEC961205DNAA.
Easy to moderate. Disconnect furnace power, remove the mounting screws, move the wire terminals to the new switch, and remount. Verify the light-blue rating matches the original part before energizing.