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The Goodman 0130F00038 is a genuine OEM auxiliary limit switch, identified by its light-blue snap-disc, designed as a direct replacement for the Amana/Goodman AMH80403ANBD gas furnace. This secondary thermal safety opens the control circuit if it senses abnormal heat in its mounting location — commonly guarding the blower compartment or a secondary heat-exchanger zone against overheating. Replacing a tripped or failed auxiliary limit restores the furnace's layered safety protection.
The color-coded OEM 0130F00038 is set to the specific trip temperature for its location in this furnace — the light-blue disc is not interchangeable with other-color limits that carry different setpoints. Substituting the wrong disc can defeat the safety or cause nuisance trips. Use the exact OEM part.
Easy — Kill power at the breaker, remove the mounting screws, move the wire terminals to the new switch, and remount in the same location. A simple sub-15-minute swap for most homeowners; confirm the disc color matches before installing.