"Err" message on my Zanussi ZWF1437W washer?

My Zanussi ZWF1437W washer has a constant "Err" message and it doesn't matter what button I press I get the same message. Have tried switching it off over night to see if it would clear but it won't. My son says he may have pressed the "Start/Pause" and "Skip/Reset" buttons at the same time as they are fairly close together instead of just pressing the start button. The machine was working perfectly beforehand. Any help would be much appreciated.