Disconnect the power before attempting any work. Use of an RCD (plug in power breaker) is recommended.
Disconnect pump from sump hose and check for obstruction in either item. Pump removal: power off, remove cover, locate pump, (attached to other end of drain pipe).undo 2 wiring connections, 2 hose connections, and pump mounting screws. Remove pump chamber - some are held in with screws, others clip into place. Check for foreign objects round the impeller. If pump chamber is clear, may be a fault with the pump motor - in which case, replace.
Repair and service your own washing machine. Go to www.2ndwave.co.uk/manual.html
dannyboy, October 2008