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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM safety control for the ACES800805CXAA gas furnace and compatible Goodman/Amana models. This thermally activated, normally-closed switch monitors temperature at a secondary location (such as the blower compartment or rollout area) and opens the circuit if it detects overheating — shutting down the burners to prevent heat-exchanger damage and fire risk.
Limit switches are calibrated to a specific trip temperature indicated by the color code. Installing the wrong rating is a safety hazard — too high allows overheating, too low causes nuisance trips. This genuine OEM Goodman switch guarantees the factory-correct light-blue trip point, terminal style, and bracket fit.
Difficulty: Easy. Power off the furnace, remove the two mounting screws, transfer the spade connectors to the new switch, and remount — about 10–20 minutes. Verify the trip color matches the original before installing. As a safety component, never bypass or substitute a mismatched rating.