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The Goodman 0130F00038 Auxiliary Limit Switch (identified by its light-blue body) is a genuine OEM thermal safety control for the AMVC80603BXCA variable-speed gas furnace. This normally-closed bimetal switch monitors temperature in the blower/heat-exchanger area and opens the control circuit if the furnace overheats — protecting the heat exchanger and cabinet from damage caused by restricted airflow, a dirty filter, or blower failure.
The light-blue color designates a specific trip temperature — installing the wrong limit rating is a safety hazard. This OEM switch guarantees the correct set point, terminal style, and mounting bracket. Generic limits are risky here because the temperature calibration must match the furnace's engineered airflow.
Two mounting screws and two push-on spade terminals. De-energize the furnace, note the wire positions, swap the switch, and confirm the contacts seat flush against the mounting surface. Verify the furnace cycles fully afterward. A common under-30-minute repair.