I have just got the same Error E:15 too, so just found your thread..
I have had the filter out and cleaned, but its still doing it
Do you know how to reset the E:15 error? Ours is wired into the wall when fitted as part of the kitchen, so we can't 'unplug it' as such to reset it, only just turn it off, which doesn't really do anything..
When turned on, it jumps into life and just spins water around the very bottom, and we can't turn it off - all with the E:15 error code.
Also as this is inset as part of the kitchen, I can't get this out to 'tilt' as others have said, but have found two pipes going to underneath the sink, to the waste?
I have attached photos, and think the only way of unblocking any food in the waste (which maybe giving the Error code) is to un-attach from sink and pump water through the pipe and back into the dishwasher? then mop it out from the DW directly?
It was originally full of water in the bottom sitting there, but now its ok after clearing it out manually.
From the pictures below, I have a single pipe and another pipe with the attachment on? Not sure which is which and which one is the waste pipe? (that maybe blocked?)
Thanks for any help :
Hope this makes some sense, and any solutions would be most welcome..