Genuine Daikin 1901771 Indoor Motorised Valve Body is the motor-operated expansion valve body in the indoor unit that meters refrigerant flow, opening and closing to the position the control board commands. When it sticks or fails, the unit may lose output, heat or cool poorly, 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.