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The Goodman 0130F00038 is the light-blue auxiliary limit switch used on the AMH81405DXCF gas furnace. As a secondary high-limit control, it provides an additional layer of overheat protection — typically monitoring the blower compartment or a specific zone of the heat exchanger — and opens the control circuit if temperatures exceed its rated setpoint. The light-blue body color denotes its specific trip rating, so always match the color/part number when replacing.
Auxiliary limits are keyed to a precise temperature setpoint identified by color. The genuine Goodman 0130F00038 guarantees the correct light-blue rating; a generic or mismatched-color switch can nuisance-trip or fail to protect. For safety controls, always use OEM.
Easy (2/5). Kill power at the disconnect, unplug the two terminals, and remove the mounting screws. Confirm the replacement is the same light-blue rating. If it trips after installation, inspect airflow and the blower before suspecting the part.