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This genuine OEM Goodman 0130F00038 auxiliary limit switch — identified by its light-blue trip marking — is a normally-closed thermal safety for the AMVC800805CNAB 80% AFUE two-stage furnace. Mounted on the blower or cabinet to guard against overheating from low airflow, a clogged filter, or a failed blower, it opens the circuit and stops the burners before temperatures exceed safe limits. A limit switch that has failed open — or nuisance-tripped and will not reset — produces a persistent no-heat condition, so the correct OEM safety part restores both heat and protection.
Limit switches are calibrated to a specific trip temperature — that is what the color code identifies. The OEM 0130F00038 guarantees the exact rating engineered for this furnace. A generic switch with the wrong trip point either nuisance-trips or fails to protect the heat exchanger, which is why matching the factory part is non-negotiable on a safety device.
Easy to Moderate — two mounting screws and two spade terminals. Cut power first, note wire orientation, and confirm continuity and a normal heat cycle after installation. Never bypass a limit switch.