Solved F 05 flashing. After reading about feedback sensors on the pump (No there isn't), about loose wire (No) and checking outlet hose (still no result), I finally completely removed the hose from the drum to the inlet side of the pump and there it was; "Bra Padding" and lot's of fibre around the ball valve (White ball inside the drum to pump hose).
Turns out the F-05 error alerts the user that the drum hasn't emptied fully. The water pressure sensor, detects the water level is still present, thus not allowing the spin to take place at the end of the cycle.
The symptons for my case: F-05 flashing; very very slow trickle from the exit hose often nothing. Sometimes no problem. Removing the filtre while running (if you dare) you see an inital emptying of the exit hose, followed by nothing, even with half a drum of water! The pump impella (!spelling!) can be seen turning so pump is OK.
Hope this helps someone T :)
Tony G
January 2011