Pretty sure F-05 error code means that there is water in the drum when there shouldn't be. i.e. after the drain process. This is sensed by a pressure switch. So it is either a pressure switch fault, a drain filter/pump fault or a blockage/kink in the hose. I managed to fix mine with a bit of hands on detailed below:
Just got the fault on my machine today (09/11/06). Water wasn't being pumped out the machine so decided to look at the drain pump (bottom left of the back of the machine). I had to empty the water manually from the machine drum before i disconnected the pump as i didn't fancy the water going all over the kitchen floor!
I then disconnected the drain pump by removing two pipes and the electrical connection. Then split the motor from the pump housing (white bit from black bit). I found a rusty old hair clip stopping the pump impellor from rotating. Assumed this was the cause of the problem. Tested it with 240v to make sure - All ok.
Before I replaced thought i should check the drain filter which comes just before the drain pump and after the drum outlet. It's within a black rubber pipe. This is removed by undoing a large jubliee clip. On removal i found another hair clip! and £1.46 in spare change!! Really must check those pockets before those trousers go in the wash.
Anyway, so I replaced the drain filter and pump and tried it out on a short cycle. Jobs a gooden! all works fine.
Jimbob Jirelli, November 2006