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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is the genuine OEM high-temperature safety cutout for the ACVC81005CXCA gas furnace. This thermally activated switch monitors temperature inside the blower or burner compartment and opens the circuit to shut off the gas valve if the furnace overheats — typically caused by restricted airflow, a dirty filter, or blower failure. It is a critical safety device that prevents heat-exchanger damage and fire risk.
The light-blue color code corresponds to a specific trip temperature. OEM Goodman switches guarantee the exact rating your furnace was engineered for. Installing a generic switch with the wrong trip point can allow dangerous overheating or cause nuisance shutdowns. Always match the OEM rating on a safety device.
Easy — two mounting screws and two spade connectors. Cut power first and confirm the replacement matches the original color/temperature code.