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The Goodman 0130F00038 Auxiliary Limit Switch (identified by its light blue body) is a genuine OEM secondary over-temperature safety control for Goodman ACEC961005CNAA furnaces. It backs up the primary limit by sensing excessive heat in the burner or blower area and interrupting the burner circuit, guarding against overheating from blocked airflow or flame rollout conditions.
The light blue color denotes a specific trip temperature. Installing a switch with the wrong setpoint — easy to do with generic parts — defeats the safety function or causes nuisance lockouts. This OEM switch matches Goodman's exact rating, so the furnace's layered safety system works as designed.
Easy (2/5). Cut power to the furnace, transfer the wiring, and swap the switch on its bracket. No gas work required. Confirm the part number and color match before installing, then test a full heat cycle. Consult a licensed HVAC technician if the switch keeps tripping.