Genuine Daikin 4022911 Outdoor Fan Motor is a single-phase AC motor, wired as the unit's fan drive, that turns the condenser fan to push air over the outdoor coil. A failing motor tends to hum without starting, spin sluggishly, or stop while the unit keeps trying to cool. Choosing the genuine motor means the fan runs at the speed Daikin set for this unit, keeping heat rejection consistent instead of leaving it to an approximate match.