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The Goodman 0130F00038 Auxiliary Limit Switch (identified by its light-blue body) is a genuine OEM safety control for the AMS80403AXAA gas furnace and compatible Goodman and Amana units. This normally-closed thermal switch monitors temperature at a secondary location in the furnace and opens the circuit to shut down heating if it senses an overheat condition — protecting the heat exchanger, blower housing, and surrounding components from thermal damage.
Limit switches are calibrated to a specific trip temperature. The OEM 0130F00038 is matched to the AMS80403AXAA cabinet design and its color-coded rating, ensuring the furnace trips at the correct setpoint. Generic or mismatched-color switches may open too early (nuisance shutdowns) or too late (unsafe operation). For a safety device, always use the OEM-rated part.
Rated Easy — mounts with two screws and two push-on spade terminals, typically a 10–15 minute repair. Cut power at the disconnect first. When in doubt, hire a licensed HVAC professional.