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The Goodman 0130F00038 is the genuine OEM auxiliary limit switch — identified by its light blue color code — used in the ACES961005CNAA gas furnace and related Goodman/Amana models. This secondary high-limit control provides backup over-temperature protection at a different location than the primary limit, typically guarding the blower compartment or secondary heat zone. When temperatures exceed its setpoint, the normally-closed switch opens to interrupt the heating sequence.
The light-blue color denotes a specific factory trip temperature. Installing the wrong rating — easy to do with unmarked generics — can cause nuisance lockouts or inadequate protection. The OEM 0130F00038 guarantees the correct setpoint, bracket, and terminals for this furnace.
Easy (1/5). Shut off power, remove the mounting screws, transfer the spade connectors, and reinstall in the same orientation. Roughly 10–15 minutes. Match the color code exactly and test a full cycle afterward.