They say you should empty the filter - behind little door front, bottom right. But I've found your question 'cos I have same problem now, and it didn't work. As yr Q was 3 months ago, can you tell us what you did to open it?
poireau
December 2009
I can answer this question...
how do i open the door of a AEG Lavamat Turbo 16810 when it is stuck?