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The Goodman 0130M00105 Defrost Thermostat is a genuine OEM temperature sensor that governs the defrost cycle on ASZ130181AC heat pumps. Clamped to the outdoor coil, it closes when coil temperature drops to the frost point and signals the defrost board to initiate a defrost cycle, then opens once the coil clears — preventing ice buildup that would cripple heating performance.
Defrost timing depends entirely on the thermostat's calibrated open/close set points. Generic sensors with even a few degrees of drift cause short-cycling defrosts or, worse, coils that ice over and lose capacity. The OEM 0130M00105 guarantees the exact temperature curve the ASZ130181AC control logic expects.
Easy (2/5). With power off, unclip the old sensor from the coil, unplug the two leads, and clip the replacement to the same tube location for accurate readings. No refrigerant work involved.