Boiler overflow leaking

[Andrew1]

Hi

I've a permanent leak from my overflow pipe. i have eliminated the bathroom system, but there is still a leak probably from the boiler, which shares the overflow pipe.

The leak can be a drip or a full flow, without any real pattern. The only clue i can offer would be the leak reduces when i open the hot water a tap flow.

the boiler heats the water only. its a insulated domestic direct cylinder. 3kw power. There are no hot water radiators in the property. The boiler is sited in the kitchen floor and there seems to be a pipe which disapears behind a false wall. Would it normally enter a header tank and if so why and what would cause the overflow to continually leak?

Thanks Andrew

 

[gas4you]

Your post is a bit unclear. Do you mean you have a fortic cylinder, a hot water cylinder with the small feed tank on top?

If so it will be the ball valve in this header tank that is not shutting off.