[Brendan (chem2clean)]

My header tank is over flowing,i have been onto prochem,looks like some kind of seal is gone in the ball cock mechanism ,3 pound fix...its going to be a few days before i have it,anyone done a DIY on one of these ,just to get by.Its a blazer xl..thanks

[Steve Chapman]

You could try bending the ball cock arm down a bit so the valve shuts of a bit earlier than it would normally ?

Steve

[Len Gribble]

I would also check your float it may have sprung a leek then turn it upside down, if you were phoenix owner you cant do that it silicon only

[Buckland]

You will probably find there is a very small gromit/washer in the ballcock valve that is letting the water slip past - they get dented by constant closing and leak - if you can find the right size it will cost about 20p to get a new one!