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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue body) is a genuine OEM overheat-protection safety for the Goodman/Amana AMS81205DXAB 80% AFUE gas furnace. This normally-closed thermal switch opens the control circuit if it senses excessive temperature — typically from a dirty filter, blocked return, or blower fault — shutting the burners down before the furnace overheats. A tripped or failed limit is a common cause of no-heat and short-cycling.
Limit switches are color-coded to a specific trip temperature — the light-blue OEM Goodman switch is calibrated for the AMS81205DXAB. Substituting a different-rated generic switch can defeat the furnace's overheat protection. Always match the OEM temperature rating.
Easy — remove two mounting screws, transfer the spade connectors, and fasten the replacement. Verify the correct part color before installing. Cut power first.