We have a ceramic Caroma toilet cistern, 414285 type 85.
Recently after half flush there is a continual slow flow of water into the pan.
Surprisingly, this is fixed by pressing the full flush button.
What can be done to just get the half flush to operate without the need to press the full flush later?
It does not seem like a seal problem, but as if the mechanical system is sticking.
Thanks, Lances