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The Goodman 0130M00105 is a genuine OEM defrost thermostat engineered as a direct-fit replacement for the ASZ130181AB heat pump. This temperature-sensing switch clips to the outdoor coil and signals the defrost control board to initiate and terminate defrost cycles in heating mode. A failed defrost thermostat is a leading cause of an iced-over outdoor coil, poor heating performance, and unnecessary compressor strain during cold weather.
This factory Goodman sensor is calibrated to the exact close/open temperatures your defrost board expects. Generic sensors with different trip points cause premature or delayed defrost cycles, wasting energy and allowing ice buildup. For reliable cold-weather heating, the OEM part is the correct choice.
Requires accessing the outdoor coil and control wiring. Shut off power first. Note the sensor's exact clip location on the coil (position affects accuracy), disconnect the two leads, and install the new thermostat in the same spot. A multimeter helps confirm continuity at temperature.