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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue dot) is a genuine OEM secondary safety control for the GDH80403ANBB gas furnace. Mounted on the blower deck or burner box, this auxiliary limit provides backup overheat and heat-rollout protection, opening the control circuit if temperatures exceed safe levels in its zone. It works alongside the primary limit to guard against blocked airflow and blower failure.
Like all limit switches, the trip temperature is matched to its color code. The light-blue 0130F00038 is not interchangeable with the pink primary limit — each protects a different zone at a different setpoint. Use the exact OEM part to preserve the furnace's layered safety design.
Easy (1/5) — Two screws and two spade terminals, about 10–15 minutes. Always disconnect power before replacing.