Zanussi Jetsystem IZ16 - E40 (E42)?

Hi, I've got a machine displying E40. Found a web post elsewhere with some diagnostic instructions on it, these led me to a more specific error code - E42! The problem I have now is how to translate E42 into english!

Some posts indicate a possible door locking mechanism problem, circuit board problem etc.

If I leave the machine 'off' when the door lock is stuck, after around 5-10 minutes, I can open the door again. Presumably some sort of servo mechanism releases after a short period.

Cannot use machine because it checks the door at the start of any program!

Help!

Product Details - IZ16
Type - P6749639
Prod No. - 914513005
Age - around 6-7 years.