Genuine Daikin 2455606 Outdoor Motorised Valve Body is the motor-operated expansion valve body in the outdoor unit that meters refrigerant flow, opening and closing to the position the control board commands. When it sticks or fails, the outdoor unit may lose output, ice up, or stop and start at odd times. A genuine valve body meters flow the way your Daikin expects, holding accurate control — where a non-genuine part can meter wrong and unsettle the system.