We have had trouble with our dishwasher and have found out what goes wrong. There is a short tower with holes in it in the dishwasher, this is the overfill overflow outlet and leads directly into the bottom tray where there is float switch that will disable the dishwasher. While this may save your kitchen floor from getting wet, there is nowhere for the water to go and it partially immerses the main pump motor that can cause it to fail. We have replaced ours twice.
What to do:
You can tip the machine onto its side which will empty the bottom tray. This should let the float switch down and the machine should work.
However water will continue to seep down the overflow and it will probably happen again.
To fix the problem turn the machine over on its side, take off the bottom tray and find the underside of the overflow. The big spring that holds the main pump motor is attached to it. You will find that there are two outlets from it, one of them has a long rubber tube attached to it. Loosen this tube from its path and connect the free end back to the other outlet of the overflow. This will make a closed loop and no water will be able to enter the base tray.
Apparently the newer models of the D63 do not have the overflow - it still has the pillar as it holds the spring for the pump moter butit doesn't have any holes in it. Er, draw your own conclusions!
Andrew Parsons, October 2007