Locate the pressure switch - a round item about 3 inches across. Sits under the top cover. Its an air operated switch which tells the machine water has reached the correct level. Disconnect the rubber pipe from the switch and blow down through it to clear any blockage. Switch itself may be faulty.
Also possible fault with inlet valves.
WASHING MACHINE SERVICE AND REPAIR MANUAL.
cut and paste the following address into your browser for more info. www.2ndwave.co.uk/manual.html
dan, February 2008