Check for kinks in the water hoses - if they're ok turn off the hose taps, remove hoses and check the plastic filters in the valve inlet connection. You will need a pair of thin pliers to grip the filter tab and pull it out. Clean any debris off with a toothbrush, rinse and reinstall in valve.
May also be low or no water pressure in the supply pipe - check by opening the tap and running into a bucket. Only other option after that is to replace the valve(s) in the machine.
Check out www.2ndwave.co.uk/manual.html
dannyboy, October 2008