Automatic Water Level Controller consist of a main electronic unit two pairs of floats one for the sub tank (optional) and another for the overhead tank. These floats continuously monitor the water level in sub tank as well as the overhead tank sends appropriate electronic signals to the main electronic unit for switching the motor  ON or OFF, accordingly. A dry sensing probe fitted to the inlet pipe at the overhead tank helps to switch OFF the in case water is not lifted even after a gap of about 1.5 minutes after switching the motor on.