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The Goodman 0130F00038 Auxiliary Limit Switch (identified by its light blue housing) is a genuine OEM high-limit safety control for the AMVC80804CNCA furnace and compatible Goodman/Amana models. This thermal snap-disc opens the control circuit if the blower compartment or heat exchanger area exceeds its rated temperature, protecting the furnace from overheating caused by restricted airflow, a dirty filter, or blower failure.
Limit switches are calibrated to a precise trip temperature — the light blue color code identifies that setpoint. Installing a generic switch with the wrong setpoint can either nuisance-trip and leave you with no heat, or fail to open when it should, defeating a critical safety. Always match the OEM part number and color code. This factory Goodman part is guaranteed to the correct calibration.
Rated Easy (1/5). De-energize the furnace, disconnect the two wire terminals, remove the mounting screws, and install the replacement in the same orientation. A 10–15 minute repair. Because this is a safety control, verify correct operation after install. When in doubt, use a licensed HVAC technician.