My Worcester Bosch 350 wall mounted combi boiler is leaking at the C/H isolating valve (flow) right underneath the boiler casing where the boiler pipework connects to the heating system pipework.This leak occurs when the boiler has cooled down after use.I have to keep topping up the system pressure regularly.Can this be repaired and if so how and will it be very expensive?My boiler is about 12 years old which like myself is getting on a bit now. Thanks for any answers

Dan Reid, December 2008

you cant really do much, some people may clag it with leak sealer til its like a valve encased in a bouncy ball but a drain down and swap of the valve is the sure way of doing it. All isolation valves are crap unfortunately and leak when touched :-(

iain, December 2008