My CDA CW494 dishwasher rotor is not spinning?

Hi, We have a built in CDA CW494 dishwasher that has recently developed a fault. When a cycle is selected it starts to run/fill but then stops. When I open it the far right light flashes 6 times, pauses, then repeats (I think this is a fault code?). If I hold down this button to reset and close the door the water drains away fine (the water has not heated up by the way). I have thoroughly cleaned the filter and also checked the far end of the inflow pipe but cannot get behind the dishwasher. By pushing the latch in the door I have got it to run with the door open, it fills up but then stops ie the rotors do not turn at all (they do turn freely by hand).

Any help/advice would be greatly appreciated!!

Neil