Being that this machine is about 10yr old I would expect that this would still be using an older 'diaphram' system to control the water level. Inside the machine, if you can find the diaphram, this will usually have two adjustable screws on it to control the water level. By screwing in each of these by a few turns may fix the problem (worked on my Candy machine). Also check any pipes that go from the diaphram for blockages etc.
Sparky P
February 2009