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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM secondary thermal safety control for the AMH81155CXCC gas furnace. This auxiliary (backup) limit provides a second layer of overheat protection beyond the primary high-limit, opening the burner circuit if temperatures at its mounting location exceed the safe threshold — a common safeguard against blocked airflow, blower failure, or heat-exchanger issues. Its light-blue color coding designates its specific trip temperature, so matching the exact OEM part is critical for correct, safe operation.
The genuine OEM light-blue 0130F00038 is factory-calibrated to the trip point the AMH81155CXCC requires at the auxiliary location. Generic replacements or mismatched color codes can nuisance-trip or fail to protect the furnace. The OEM part ensures correct calibration, terminal type, and bracket fit for a true drop-in replacement.
Easy (2/5). Disconnect power, unscrew the switch from its bracket, transfer the two spade wires, and mount the replacement in the same position — roughly 15 minutes. Confirm normal heating cycles and safe overheat cutout after the swap. If you cannot locate the auxiliary limit, consult the furnace wiring diagram or a licensed technician.