Found it at last!! - if it stops in the cycle, constant beeps and flashes. It's a blocked 'thing'. Remove the bottom spray bar and the removable filter. Now remove the steel grid. This exposes the sump. Now, near a white 'sticky up sensor' there is a black grid the size of a 50p. Use a shaving mirror and you will see it is blocked. Use a toothbrush and squirt water into it (I used a hosepipe)- Hooray - clean dishes again!!!!!
johnw
September 2009