While you wait for answers, we may have found some information which could help you.
Click here for Replaced Pipes StartHow to fix Kenwood Slimline Dishwasher KDW45X20 with a F1 Er?
How can I mend my Zanussi ZDLN1512 dishwasher?
K8D45517?
Clear E1 error code on smeg dishwasher with no water or leak?
Which way up is the upper spray arm - with holes uppermost o?
Water won’t pump out?