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The Goodman 0130F00038 Auxiliary Limit Switch (identified by its light-blue body) is a genuine OEM secondary safety control for the AMEC961005CNAD gas furnace. This auxiliary limit protects a specific zone of the furnace — commonly the blower compartment or a secondary heat-exchanger area — by opening the control circuit if that region exceeds its safe temperature, providing a backup layer of over-temperature protection beyond the primary limit.
Auxiliary limits are calibrated to a specific trip temperature and location — the light-blue color coding exists precisely so the correct switch is installed. The OEM 0130F00038 guarantees the right setpoint and fit. Installing a generic switch with a different rating can defeat the furnace's layered safety design. We recommend OEM for all safety-limit replacements.
Easy (DIY-friendly). With power disconnected, remove the mounting screws, transfer the two wires, and secure the new switch. Confirm the color/rating matches before installing, and address any airflow issue if the limit had tripped.