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The Goodman 0130F00038 Auxiliary Limit Switch (identified by its light-blue housing) is a genuine OEM safety control for the AMVC80604BXBD gas furnace and compatible Goodman/Amana models. This normally-closed thermal switch monitors furnace temperature and opens the circuit to shut off the burners if the unit overheats — protecting the heat exchanger and preventing unsafe conditions. A tripped or failed limit switch will prevent the furnace from firing, so an exact OEM replacement is essential to safe operation.
Limit switches are matched to a specific trip temperature — indicated here by the light-blue color. The genuine OEM switch guarantees the correct set point. A generic switch with the wrong rating can nuisance-trip or, worse, fail to protect the furnace. For a safety device, always use the exact OEM part.
Easy — mounts with two screws and two spade terminals. Power off the furnace, note wire positions, swap the switch, and reconnect. A straightforward 15-minute repair.