Can you post the model number please.
Arrh ive seen this fault a few times. Theres no adjustment in the display screen on this model so im afraid you have a faulty control board here. The display screen on the board is faulty.
What you can try first if you haven't already is try it in a different socket just incase you have a faulty socket.
But if still the same then you need to either take it back to were you got it from or give Beko a ring and they will come out and replace the control board. This is up to you as the washer is under 28 days you do have a right to return it for a refund as its faulty.
If you need anymore info just get back to me.