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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM safety component for the Amana/Goodman AMH80805CNBD 80% AFUE gas furnace. This auxiliary (rollout or secondary high-limit) switch monitors temperature and opens the control circuit if the furnace overheats — protecting the heat exchanger and blower housing from thermal damage caused by restricted airflow, a dirty filter, or a failing blower.
OEM vs. Generic: The light-blue color code corresponds to a specific factory trip temperature. Installing an incorrectly rated generic switch can cause either nuisance shutdowns or, worse, a failure to trip when needed. Always match the exact OEM part and color code for this safety circuit.
Install difficulty: Easy (1/5). With power off, disconnect the two wire terminals, remove the mounting screws, and install the replacement in the same orientation. Verify the switch resets and the furnace cycles normally. Typical replacement time is under 15 minutes.