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This genuine OEM Goodman/Amana auxiliary limit switch (part number 0130F00038, identified by its light-blue body) is a direct-fit thermal safety control for the AMH81205DNBB furnace and related Goodman/Amana models. The auxiliary limit is a normally-closed thermal cutout that opens if the blower compartment or heat exchanger area exceeds its rated temperature — for example during a stuck blower, a dirty filter, or restricted airflow. When it trips, it interrupts the burner circuit to prevent overheating and potential heat-exchanger damage.
Because a limit switch is a calibrated safety device, the OEM 0130F00038 is matched to the exact trip and reset temperatures the AMH81205DNBB was engineered for. The light-blue color code identifies its specific set point — installing a generic switch or the wrong color code can cause premature nuisance trips or, worse, fail to protect the furnace at the correct temperature. Always match the OEM part and color.
Easy (1 of 5). Shut off power, note the wire positions, remove the two mounting screws, transfer the spade terminals, and reinstall — about 10 minutes. Confirm the correct color code before ordering a replacement.