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The Goodman 0130F00038 Auxiliary Limit Switch (identified by its light blue housing) is a genuine OEM secondary high-limit safety control for the Amana/Goodman AMEH800805CNAA gas furnace. This thermal switch provides backup overheat protection beyond the primary limit, interrupting the gas valve circuit if temperatures rise beyond safe levels in its monitored zone. The color code identifies its specific trip rating so it isn't confused with other limits in the cabinet.
Because the light-blue color denotes a specific trip temperature, matching the exact OEM part is essential — installing the wrong-rated switch defeats the safety design. This factory OEM control guarantees the correct setpoint and bracket fit. Generic substitutes rarely carry the matching color/rating and should be avoided on safety circuits.
Easy (2/5). Disconnect power, remove the mounting screws, transfer the wire terminals, and secure the new switch. About a 10-minute job. If this switch has tripped, inspect for blocked airflow or venting issues before returning the furnace to service.