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The Goodman 0130F00038 Auxiliary Limit Switch, identified by its light-blue housing, is the genuine OEM high-temperature safety control for the ACEC801005CXAB and related Goodman/Amana furnaces. This normally-closed thermal switch monitors temperature in the blower or burner compartment and opens the circuit if heat exceeds a safe threshold — protecting the heat exchanger and surrounding components from overheating caused by restricted airflow, dirty filters, or blower failure.
The light-blue color denotes a specific trip and reset temperature calibration. The OEM 0130F00038 guarantees that exact set point — critical for a safety device. Generic switches with a different temperature rating can trip prematurely (nuisance shutdowns) or fail to trip when needed. Always match the OEM color/temperature spec on limit controls.
Easy (1/5). Disconnect power, remove the two mounting screws, transfer the wire terminals one at a time, and reinstall. Roughly 10–15 minutes with basic hand tools.