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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM safety control engineered for the AMH80903BXCB furnace and compatible Goodman and Amana gas furnace platforms. This normally-closed thermal switch monitors internal cabinet temperature and opens the circuit if the furnace overheats, shutting down the burners to protect the heat exchanger and blower assembly from damage.
This is a factory-original Goodman part, calibrated to the exact trip temperature specified for your furnace. Unlike universal aftermarket switches, an OEM limit switch guarantees the correct cutout point — critical for both safety compliance and warranty protection. Generic substitutes may trip early (nuisance shutdowns) or late (overheating risk).
Easy (1 of 5). Replacement typically requires disconnecting power, removing two mounting screws, and transferring the two spade wire connectors. Most homeowners with basic tools can complete this in under 15 minutes. Always shut off power and gas before servicing.