Not sure but there could be a pressure vessel that is blocked with cr*p. It operates a pressure line as it fills, like a vacuum line in reverse, to an electrical switch.
Inspect the various water hoses and to see if one leads to a small container that has another hose going to an electrical switch. If that container looks like it needs a clean it could be stopping the pressure activating the switch.
Let me know how you go. My email address is danandco@optusnet.com.au
Good luck
Dan, June 2008
