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The 0130M00105 is the OEM defrost thermostat (coil temperature sensor) for the Goodman ANZ130181AC heat pump. Clamped to the outdoor coil, it closes when the coil drops to the defrost setpoint and opens when it warms back up, giving the defrost control board the signal it needs to clear frost from the coil in heating mode. A failed thermostat is a leading cause of a heat pump that ices over or, conversely, runs defrost cycles far too often and wastes energy.
OEM ensures the exact close/open temperature setpoints your defrost board expects. Generic thermostats with different trip points will make the unit defrost too early or too late, hurting efficiency and comfort. At this price, matching the factory sensor is the smart move.
Kill power at the disconnect, unclip the old sensor from the coil tube, unplug the two leads, then clip the new one to the same spot and reconnect. No refrigerant or brazing involved. Estimated time: 10-20 minutes.