How can I fix my washing machine?

I have a Hotpoint Aquarius ultima 1400 wm76 model and everytime I try to put on a wash load it spins for about 10 minutes then stops and comes up with a message saying check water supply. I have checked to make sure everything is connected properly and that the water is switched on but this doesn't seem to work and I cannot do any washing, what do I need to do to fix this problem?