Flashing Start Button ADP 7966 Whirlpool Dishwasher?

I have got a Whirlpool 6th sense ADP7966 dish washer. The machine runs a normal wash cycle but when it comes to the drying of the dishes after the unit has emptied the start button flashes. 2 x Flashes close together a short gap and another 2 flashes thus stopping the unit from running. Has anyone got any idea? All of the pipes are clear from any blockages.