Zanussi ZWF12070G1 will not start prog

I would be grateful for some help with this problem on a zanussi wm the lights come on but when you press the start button the start light just flashes and the door doesn’t lock ive tried a new interlock, meggered it ,checked all resistances there is i think a fault on the board but i cannot work out where any ideas would be good my only one now is to dump the whole thing in the bin.