Genuine Daikin 4025320 Outdoor Fan Motor turns the condenser fan that pushes air over the outdoor coil, the part of the cycle where your system releases its heat. You may first notice it failing when the fan is slow to start, runs noisily, or quits while the unit keeps trying to run. The genuine motor returns the fan to the behaviour Daikin engineered for the unit, where a substitute can leave airflow short and the unit running hotter than it should.