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The Goodman 0130F00038 Auxiliary Limit Switch (identified by its light-blue housing) is a genuine OEM high-temperature safety control for the ACVC81005CXBD gas furnace and compatible models. This auxiliary limit monitors temperature at a secondary location in the furnace and opens the control circuit if it detects an overheat condition caused by restricted airflow, a dirty filter, or blower failure — protecting the heat exchanger from damage.
Goodman color-codes auxiliary limits to their factory trip temperature, and the light-blue 0130F00038 is matched to this furnace's design. Using a generic switch risks an incorrect trip point that either nuisance-trips or fails to protect the equipment. For a safety control, the OEM color-matched part is the right choice.
Easy (1/5) — Two spade terminals and screw-mounted to the furnace housing. Shut off power before servicing. Repeated tripping indicates an airflow problem that should be corrected, not bypassed.