This error code signals that the washer is too slow to fill.
For instance, if it takes more than 10 minutes for the washer to fill, check the inlet valves: not unlikely, they are turned off. If you see the code on the screen, the water level has not changed for a long time or the water level sensor is not reading properly.
Check the tube, which connects the dispenser with the drum and make sure it is not blocked or clogged. If it is all right, check the inlet water valve assembly.