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The Goodman 0130F00038 Auxiliary Limit Switch (identified by its light-blue body) is a genuine OEM thermal safety control for the ACEC801005CXAA and other compatible Goodman/Amana gas furnaces. This normally-closed snap-disc switch monitors temperature at a critical location and opens the control circuit if the furnace overheats, shutting down the burners to prevent heat-exchanger damage. The color code corresponds to the factory trip temperature for this position.
The trip temperature on a limit switch is safety-critical. OEM 0130F00038 is calibrated to the exact factory open/close setpoint for this model and position; the light-blue code ensures you install the correct rating. Generic switches with different setpoints can either nuisance-trip or, worse, fail to protect the heat exchanger. Always match the OEM color/rating.
Easy. Disconnect power, unplug the two wires, remove the mounting screws, and install the new switch in the same orientation. Confirm continuity at room temperature after install. Never bypass a limit switch — replace with the correct OEM rating.