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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM secondary safety control for the Goodman ADVC80603BNBB furnace and compatible models. Mounted in the blower or auxiliary air path, it monitors for abnormal temperature conditions — such as restricted airflow or a failed blower — and interrupts the burner circuit to prevent overheating.
The OEM Goodman auxiliary switch is set to the factory-specified trip temperature and physical footprint, ensuring proper fit and reliable protection. Generic units may not match the exact trip point or mounting geometry, leading to fitment issues or improper safety response. Because this switch backs up the primary limit, OEM accuracy matters.
Easy (1/5) — Straightforward swap with a screwdriver. Cut power at the breaker before working, note wire orientation, and confirm the color-coded switch matches the auxiliary position (light blue), not the primary (pink).