1) Check whether the tank is mounted properly and the rubber plug is fixed securely.
2) Check whether the tank has been refilled properly; if any, remove and refill it, and then try again.
3) Check whether mopping board has been mounted properly, and re-mount it if necessary.
4) Check whether the mop gets dirty or is not attached flat, and re-attach it and then try again.
5) Check the App whether water level is set to the minimum, and set it properly and then try again.
6) Restart the equipment and try again.