Genuine Daikin 4012099 Capacitor is the motor capacitor that supplies the phase shift its single-phase motor needs to start and run under load in the unit. When it weakens the motor starts hard, runs slow, or stalls and trips on the overload. As the capacitor is a low-cost part against the motor it protects, the genuine Daikin unit is the sensible fit — held to its rated value where a generic that drifts low leaves the motor labouring.