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The Goodman 0130M00105 is a genuine OEM defrost thermostat that clips to the outdoor coil of the ANZ130481AB heat pump. It senses coil temperature and signals the defrost control board to initiate and terminate the defrost cycle, preventing ice buildup that would otherwise choke airflow and starve the system in winter. A failed defrost thermostat is a leading cause of a frozen outdoor coil and lost heating capacity.
This OEM thermostat is calibrated to Goodman's exact open/close temperature setpoints so the defrost board behaves as designed. Generic clip-on switches with different trip points can cause short-cycling, unnecessary defrosts (wasting energy), or missed defrosts (icing). At this price, factory calibration is the obvious choice.
Easy (2/5). Disconnect power, unplug the two-wire lead, unclip the old sensor, and snap the new one onto the same coil location. A 10-minute repair for a handy owner or technician.