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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM safety control for the AMEC800804CNAA gas furnace and compatible Goodman/Amana models. This secondary limit protects the blower compartment and surrounding areas by opening the control circuit if temperatures exceed a safe threshold — a key backup to the primary limit for safe furnace operation.
Auxiliary limits are color-coded to a specific trip point — the light blue 0130F00038 must be matched exactly. Installing a limit with the wrong set point causes either nuisance lockouts or unsafe operation. The OEM part guarantees the correct temperature rating and terminal layout for a true drop-in replacement.
Easy — disconnect power, remove the mounting screws and spade terminals, and install the new switch in the identical location and orientation. Usually a 10–15 minute repair. Always confirm the color code matches the part you removed.