Genuine Daikin 604370 Run Capacitor is the 11 µF, 400 V capacitor that supplies the continuous phase shift a single-phase motor needs to run efficiently once it is up to speed. As it ages and loses capacitance the motor draws more current, runs hotter, and can stall or trip under load. Because a run capacitor is inexpensive against the motor it serves, fitting the genuine 11 µF/400 V part is the obvious move — holding its value where a drifting generic quietly cooks the winding.