E9 is a user interface board fault.
But as you have already replaced the user board then just check the wiring block going to the user board and the main board.
If the wiring block is fine then the power board on the right is more then likely the fault here. What you can try as both boards are the same is swap them over. Remove the left board and fit to the right hand side and make sure all the wiring blocks are swaped over and see if this works.
Fingers crossed that may work. If not then the power board itself will need to be replaced.
These boards are always failing on the induction hobs as that's all that seems to fail on these.
As its only 16 months old an give the price of them I would give Zanussi a ring as ive seem then extend the warrentys on these for people and fix it for free or at least supply the parts for free so well worth giving them a bell as you never know.
Hi Daniel. I am going to up-end the thing again tomorrow and look for this other board and try the swapover and wiring check. May need a little more info then, and will rate then. Thanks. Charlotte
Daniel - just thinking - I don't remember seeing a second board - it wasn't obviously visible, but if I find it, and try the swap-over, is it possible that the replacement user interface board I fitted might be configured differently to the power board and if so, will they work if swapped over or could swapping them and trying the hob cause more damage? (PS, it's working perfectly just at the moment. Grrrrrr).