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The genuine OEM Goodman 0130F00038 Auxiliary Limit Switch (light-blue body) is a temperature-activated safety control for the Goodman ACEC800805CXAA furnace. It monitors a secondary location for abnormal heat and opens the circuit to shut down the burners if temperatures exceed the safe threshold — protecting the heat exchanger and surrounding components from damage caused by restricted airflow or blower failure.
Limit switches are color-coded to a specific trip temperature. The OEM light-blue 0130F00038 guarantees the correct setpoint and terminal layout. A generic switch with the wrong trip point can either nuisance-trip or fail to protect the unit. Always match OEM on safety controls.
Easy. Cut power, remove two mounting screws, transfer the wiring, and reinstall. A 10–15 minute job for most DIYers.