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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is the genuine OEM secondary temperature-limit safety for the AMH80603ANBA 80% AFUE gas furnace and compatible Goodman/Amana models. The color-coded light-blue cap identifies its factory trip temperature. This normally-closed switch backs up the primary limit — if it senses excessive heat at its mounting location (such as the blower deck or heat-exchanger area), it interrupts the gas valve circuit to prevent overheating.
Color-coded auxiliary limits are calibrated to a specific set point — installing the wrong temperature rating causes nuisance trips or defeats the safety entirely. The OEM 0130F00038 guarantees the correct light-blue calibration for this furnace. Match the color code exactly.
Rating: Easy (1/5). Two spade terminals and a snap-in or single-screw mount. Shut off power and gas first. If this limit is tripping, investigate airflow restrictions before replacing the switch.