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The Goodman 0130F00038 is the light-blue-coded auxiliary limit switch for ACES800403ANAA gas furnaces. This secondary thermal control protects against abnormal heat buildup in the blower compartment or near the heat exchanger, opening the circuit and shutting down the furnace when its rated temperature is exceeded. As with all Goodman limits, the light-blue color band designates the specific trip temperature for this position.
This OEM Goodman auxiliary limit is factory-calibrated to the correct set point for its mounting location. Because it is a life-safety device, do not substitute a different color code or a generic switch — an incorrect trip temperature defeats the protection it is designed to provide. Match the light-blue OEM part exactly.
Easy. Disconnect power, remove the mounting screws, move the wire connectors to the new switch, and reinstall in the same orientation. Typically under 15 minutes. Always diagnose why the limit tripped before returning the furnace to service.