it sound like either the jets are blocked in which case you'll need a safety pin and the help of friend to fix it. one of you to press the washer button and the other poke the safety pin through the water jets. if this dosn't fix it, then you could have an air lock in the pipe feed from the washer pump, unfortunately this is a bit fiddly to fix as it involves removing the sweated pipe from behind the jet you will some hot water applied to the pipe where it joins the jet to soften the pipe to remove it then get you friend to press the pump untill the water flows freely, then re-soften the pipe and put it back on to the jet. good luck.
derek
February 2009