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The Goodman 0130M00105 Defrost Thermostat is a genuine OEM temperature sensor that mounts to the outdoor coil of your ASZ130361AG heat pump. It closes when the coil reaches a low temperature and works with the defrost control board to initiate a defrost cycle, melting frost and ice buildup so your system keeps heating efficiently in cold weather.
The genuine OEM 0130M00105 is calibrated to Goodman's exact defrost set points. Generic snap discs may close and open at different temperatures, causing too-frequent defrost cycles (wasting energy) or too-few cycles (allowing ice to accumulate and damage the coil). For accurate defrost timing, the factory-matched thermostat is worth the small price difference.
Cut power to the unit, unclip the two spade wires, unfasten the sensor from the coil tube or bracket, and clip the new one in place — noting the mounting location for proper thermal contact. Typical replacement takes 10–15 minutes with basic hand tools. No refrigerant work is required.
A failing defrost thermostat is a frequent cause of ice-covered outdoor coils and weak winter heating. Restore reliable defrost operation with this genuine OEM Goodman part.