If continually running you need to adjust the inlet valve to lower the water level, If it runns for a while then stops there's probably a bit of grit/scum around the base of the flush mechanism...
Either way a pic or two with the lid off will help..
_________________
.
If you feel you have benefited from the
Free advice given on the Forum, Please consider making a donation to UHM's Nominated charity, read all about it and donate here :
http://www.donnasdreamhouse.co.uk/__________________________________
__________________________________
Verwood HandymanI Know it says I'm On-line, but I might have just left myself logged in, whilst I'm out....