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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue coded) is a genuine OEM temperature safety control for the AMH80604BNBB gas furnace. This normally-closed thermal switch monitors heat around the blower/rollout area and opens the circuit to shut the furnace down if temperatures exceed the safe threshold — protecting the heat exchanger and surrounding components from overheating.
Limit switches are calibrated to a specific trip temperature — the light-blue color code identifies that exact rating. Using the OEM 0130F00038 guarantees the correct trip point; a mismatched generic switch can nuisance-trip or, worse, fail to trip. Safety components should always be OEM.
Easy — Cut power to the furnace, disconnect the two spade terminals, remove the mounting screws, and install the replacement in the same orientation. Confirm normal heat cycling afterward.