We have exactly the same problem with our Bosch dishwasher which
"gave up the ghost" at 18 months old!!!! It is also 450mm wide.

Incidentally, the machines now have a 2 year guarantee!!!!

Again, you probably have a claim under statutory rights against the retailer
(not the manufacturer). This is not a dodgy make bought from a market
trader, but a premium product. With two people in a small newsgroup with the
same problem, it sounds like a manufacturing or design defect to me.

Christian.