How can I fix my AEG Lavamat 66600?

My AEG Lavamat 66600 will not rinse in the normal wash/rinse cycle. It pumps continually after the last wash then shows Error Code E20. I have drained all water away through the little rubber pipe and checked the filter. Eventually with a lot of coaxing I can get it to re-start on a new rinse cyle. Occasionally Error Code E60 comes up......not listed in the manual. I suspect the sensor thinks that there is still water in there, can I disable the sensor? Alternatively there may be a blockage before the filter is there a service insruction showing how to disassemble and re-assemble? The strange thing is that the wash cycle includes a drain and re-fill which works fine.