Genuine Daikin 168685J Motorised Valve Body is the motor-operated expansion valve body that meters refrigerant flow through the system, opening and closing to the position the control board commands. When it sticks or fails, the unit may lose output, heat or cool poorly, 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.