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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue body) is a genuine OEM safety control for the AMS80805CXAD gas furnace and related Goodman/Amana models. This normally-closed thermal switch opens the control circuit and shuts down the gas valve if it senses excessive temperature — typically caused by restricted airflow, a dirty filter, or a failed blower. When an auxiliary limit trips and won't reset, or stays open, the furnace will not fire, making this an inexpensive but essential replacement.
OEM vs. Generic: Limit switches are color-coded to a specific open/close temperature. This OEM part carries the exact trip point Goodman specified for the AMS80805CXAD heat exchanger. Substituting a generic switch with a different rating can defeat the furnace's overheat protection or cause nuisance shutdowns — always match the OEM temperature spec.
Install difficulty: Easy (1/5). Kill power to the furnace, note the wire positions, remove two mounting screws, transfer the spade connectors, and mount the new switch. A five-minute job with a nut driver. Confirm the blower and filter are clean so the new switch isn't tripped by an underlying airflow problem.