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The Goodman 0130F00038 is a genuine OEM auxiliary limit switch, identified by its light-blue housing, used on the AMVC80805CNBB gas furnace. This secondary temperature-sensing safety control supplements the main high limit, opening the burner circuit if it detects abnormal heat in its mounting location — for example around the blower or heat-exchanger area — to guard against overheating conditions the primary limit may not see. Matching the correct color-coded trip rating is important, since Goodman uses housing color to distinguish switches with different setpoints.
The light-blue color code tells you the exact trip temperature this position requires. This factory Goodman part is guaranteed to carry the correct setpoint and mounting footprint, so the safety circuit behaves as certified. Generic switches — or the wrong color — can trip early, causing nuisance shutdowns, or trip late and fail to protect the furnace. Always match the OEM part number and color for safety controls.
Turn off power and gas, remove the access panel, and locate the light-blue switch. Disconnect the two spade terminals, remove the mounting screws, and install the replacement in the same orientation. A multimeter confirms whether the old switch has opened. Most experienced DIYers finish in 20–30 minutes. If the switch keeps tripping after replacement, have a licensed technician investigate airflow or heat-exchanger issues before running the furnace.