AEG 16800 will not Wash?

My daughters AEG lavamatt 16800 appears to fill up, spin, drain ok BUT WILL NOT START WASH CYCLE, except for filling up - the motor does not turn ( works ok on spin) the digital timer starts to count down for a couple of mins then returns back to the start and flashes the time bUt no error codes displayed.
another question/answer refered to the tachometer but symtoms are slightly different Help please!!!