Zanussi Jetsystem 1400 wont start?

Hi, any help would be really appreciated.

I have a Zanussi Jetsystem 1400 FJS1425W Model which was given to me by a friend. It worked perfectly for her but for me it wont start. The water supply is attached and the taps are definitely on, the door lock light comes on, all the lights are on and u can select all the options for your programme fine, but when u press start it beeps but nothing starts. The green light above the start button remains flashing constantly when it should go solid green and start. Thanks v much in advance

Michelle