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The Goodman 0130F00038 auxiliary limit switch — identified by its light-blue body — is a genuine OEM safety control for the Goodman ACSS960603BNAA 96% AFUE gas furnace and compatible Goodman/Amana models. This secondary thermal cutout backs up the primary limit, opening the burner circuit if it detects an over-temperature or flame-rollout condition. The light-blue color code indicates its specific trip temperature, so matching the exact part is critical.
Color-coded limit switches must match the original trip point exactly. Installing the wrong-temperature switch defeats the furnace's layered safety design. The OEM light-blue 0130F00038 is calibrated and color-matched to your furnace's specification — never substitute by appearance alone.
Moderate (3/5). Power off, remove the mounting screws, and transfer the spade connectors. Confirm the replacement matches the light-blue color code before installing. Basic HVAC knowledge recommended.