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The Goodman 0130M00105 is a genuine OEM defrost thermostat (defrost termination / coil sensor) built as a direct-fit replacement for the ASZ130181AD heat pump condenser. Clipped to the outdoor coil, this temperature-sensing switch tells the defrost control board when frost has accumulated and when the coil has cleared, initiating and terminating the defrost cycle. A failed defrost thermostat is a leading cause of iced-up coils and poor heating performance in winter.
The OEM Goodman thermostat is calibrated to the exact close/open temperature setpoints the ASZ130181AD defrost board expects. Generic snap-discs with different setpoints can cause short-cycling defrost, wasted energy, or coil freeze-ups. Given the low cost, OEM is the safe choice.
Easy to Moderate (DIY-Friendly). Power off at the breaker, unclip the old sensor from the coil, transfer the two spade connectors, and clip the new one in the same location. No refrigerant work required, but note wire routing before removal.