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The Goodman 0130F00038 auxiliary limit switch — color-coded light blue — is a genuine OEM secondary safety control for the Goodman GDH80403AXBA gas furnace and compatible units. This auxiliary limit provides a backup over-temperature cutout, often mounted near the blower housing or secondary heat exchanger. It opens the control circuit if temperatures exceed the safe threshold, protecting against restricted airflow, blower failure, or flame rollout conditions.
Like all Goodman limit switches, the light-blue color code corresponds to a factory-set trip temperature. Installing a mismatched rating can cause repeated lockouts or defeat the safety entirely. This OEM part ensures the exact temperature calibration, bracket, and terminals for a true drop-in replacement — no guesswork.
Easy (1/5) — Mounts with two screws and connects via spade terminals. Cut power before servicing. Most repairs take under 15 minutes.