Zanussi ZWX 1605 W won't start - 'End' LED flashing

[ABL]

Hi, this is my first post on this site and I hope that someone will be able to help me solve a problem on a Zanussi washing machine. I have read loads of messages from others on this site and cannot find anything that is similar. My father-in-law, who owns the washing machine and has said it has been working very well up to the other day, said he loaded the machine, pressed the on/off button, the 'End' LED immediately started flashing green continuously and nothing happened when he pressed the start button.  I have managed, by pressing different buttons (?), to get the LEDs (green) on the control panel to light up individually and to cycle round lighting up one after the other, and note that the 'Filter' LED lights up red, rather than green.  So I have checked the drain pump chamber and the  and the inlet supply water filter for blockages to no avail. Can anyone please offer any advice as to what could be the reason for this and what I can do to get the machine working correctly again. Thanks ABL