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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM secondary temperature safety control for the AMH80904BXCA gas furnace. This auxiliary limit backs up the primary high-limit, opening the burner circuit if it senses excessive heat in its monitored zone — for example from blocked airflow or a blower fault. The light-blue body color identifies its factory trip calibration, so matching the exact part is important.
The OEM 0130F00038 is color-coded to a specific trip and reset temperature that the AMH80904BXCA design requires. Substituting a differently rated snap-disc — even one that looks identical — can cause nuisance trips or, worse, fail to trip when it should. Because this is a safety device, always match the OEM number and color.
Easy (1/5). Disconnect two leads, remove one or two screws, and mount the replacement in the same orientation. Cut power and gas before servicing. Confirm continuity with a meter and, if the switch was tripping, diagnose the underlying airflow or blower issue before returning the furnace to service.