I had exactly the same problem. I replaced the door locking mechanism (around ÂŁ30) but that didn't fix it. It turned out the circuit board had blown near one of the connectors (they're all at the top front of the machine under a cover, if you take the top off-look for scorch marks!). New boards are up to ÂŁ160, so we repaired it ourselves with a bit of soldering...and it actually worked! Result.
michael byrne
August 2007