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The 0130F00038 auxiliary limit switch — identified by its light-blue housing — is a genuine OEM safety control for the Goodman/Amana AMS80604BXAA gas furnace. This thermally activated switch monitors temperature at a secondary location and opens the circuit if it senses an overheat or heat-rollout condition, shutting down the burners to prevent damage to the heat exchanger and surrounding cabinet. A tripped or failed auxiliary limit is a frequent cause of a furnace that heats then locks out on a safety fault.
The OEM switch is calibrated to the exact trip temperature Goodman specifies for this furnace, with the correct terminal orientation and bracket. Generic limits may carry a different set point, which can cause premature tripping or, worse, fail to protect at the intended temperature. For a safety component, OEM is strongly recommended.
Easy (1/5). Disconnect power, remove the two mounting screws, transfer the spade connectors, and remount. About 10–15 minutes. Confirm the correct trip rating matches the removed part before installing.