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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue coded) is a genuine OEM safety control for the ACVC80805CXBD 80% AFUE gas furnace and related Goodman/Amana models. This thermally-activated switch monitors temperature and opens the circuit to shut down the burners if the furnace overheats — protecting the heat exchanger and home from unsafe conditions. The light-blue color denotes its specific trip-temperature rating.
Limit switches are calibrated to a precise trip temperature — matching the color code is essential. The genuine Goodman 0130F00038 opens and resets at the exact factory setpoint. A generic switch with the wrong rating can either trip prematurely (nuisance shutdowns) or fail to trip when needed (a serious safety risk). Always match OEM for safety controls.
Easy — Typically two mounting screws and spade wire connectors. Shut off power and gas, note wire positions, and verify the color/part number matches the original before installing. A quick repair for restoring safe furnace operation.