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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue body) is a genuine OEM thermal safety limit for the Amana/Goodman AMES800403AXAA 80% AFUE gas furnace and compatible AMES80 models. This normally-closed auxiliary limit monitors temperature at the blower/heat-exchanger area and opens the control circuit if it senses an overheat condition — for example from a blocked filter, failing blower, or restricted airflow — shutting down the burners to prevent damage.
Limit switches are safety-critical and are calibrated to a specific trip temperature — indicated here by the light-blue color code. Installing the genuine OEM part guarantees the correct open/close set point. A mismatched generic switch can trip too early (nuisance shutdowns) or too late (defeating the overheat protection). Always match the exact color/temperature rating.
Difficulty: Easy. With power off, remove the two mounting screws, transfer the two spade-terminal wires to the new switch, and remount. A 10–15 minute repair. Confirm the airflow issue that caused the trip (dirty filter, blower fault) is also corrected so the new switch isn't stressed.
Backed by our fit guarantee for the AMES800403AXAA. Questions? Contact info@nationalhvacparts.com.