What do you mean?
is the cistern continually filling to overflow?
nobby, December 2008
you can stop the water supply, or there is a little plastic screw at the end of the ball arm. turn the screw when the ball is at the bottom of the cistern so it will not rise, this will stop it filling itself.
good luck
b, November 2008
edit
I can answer this question...
how do you stop a toiler that is constantly refilling itself?