Had a couple of problems with my Beko WMA1715 since getting it 3 years ago. First I got the prewash light flashing as described earlier. This turned out to be a bra wire (grrrrr!) stuck in the pump. Removing it and resetting the processor in the method shown on here worked fine. Three days after the warranty ran out I got same fault, however the programmer would not reset. Turned out to need a new program card.
Latest fault was as before, but prewash light not flashing. After entering engineer mode (off at button, 90 degree wash, hold start/cancel 3 secs, press on, still holding, until start light flashes), I pressed start button to advance through the program. Everything worked except the drum would not turn. Turned to spin, pressed start/cancel 3 secs to reset, then press off. When I turned it back on, I opened the door, and turned the drum by hand. Closed door and it now works fine. Suspect the carbon brushes are worn, so will replace them next time it stops (although its done a few washes so far ok!)
Ady, November 2007