While you wait for answers, we may have found some information which could help you.
Click here for Code E4 DishwasherHow can I mend my Zanussi ZDLN1512 dishwasher?
K8D45517?
Why is dishwasher not fully drained of water?
How to install new knob for smeg dishwasher Type 10028; mod:?
Hotpoint Start/Pause button flashing?
Beko dwd5411w?