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The Goodman 0130M00105 Defrost Thermostat is the genuine OEM temperature sensor that tells the defrost control board when the outdoor coil on your ASZ130241AF heat pump has iced over. Clipped to the outdoor coil tubing, it closes at a fixed low temperature to permit a defrost cycle and opens once the coil clears — preventing frost buildup that would otherwise choke airflow and cripple heating performance in winter.
Defrost thermostats are calibrated to specific open/close temperatures. The OEM 0130M00105 matches the ASZ130241AF's factory defrost logic exactly, so cycles start and end at the correct coil temperatures. Generic sensors with different set points can cause premature defrosts (wasting energy) or missed defrosts (ice-blocked coils). We recommend OEM for correct, efficient operation.
Easy (2/5). Shut off power at the disconnect, note the two wire connections, unclip the old sensor from the coil, clip the new one to the same tube, and reconnect the terminals. Typically 15–20 minutes. Ensure firm coil contact for accurate temperature sensing.