How can I fix my Kenwood Dishwasher KDW12ST3A?

There is no error message displayed, it just beeps, displays everything on the display and stops. When I turn it onto an Eco Wash P4(1hr 38mins) it works up to 1hr 20mins then turns off. It does the same on the P5 wash - works for 1 minute then beeps, displays everything and turns off. Water comes into the machine but it seems it won't recycle round the machine. I can get the water to drain out by setting it to a pre wash setting. Please help!!