Genuine Daikin 623960 Capacitor is the motor capacitor that supplies the phase shift keeping its single-phase motor starting and running under load in the unit. When it weakens the motor starts hard, runs slow, or stalls and trips on overload. Because the capacitor is a low-cost part against the motor it serves, fitting the genuine Daikin unit on the same job is the sensible call — held to its rated value where a generic that drifts leaves the motor straining.