Hi there, I've currently bought a new property (about a 10 year old house) I am having problems with a leaking overflow. Going into the loft I have identified 2 tanks with 2 overflows coming off these. The larger of the 2 tanks appears to be over full when the overflow leaks. Initially I thought this was to do with the ball valve mechanism rubber washer, like a toilet cistern, being perished. But upon inspection this seems ok. It tends to overflow when the boiler has been on heating the water. I went up their this morning as the overflow was going again and there is a return pipe from the hot water jacket sending water back to the water storage tank. Could anyone help me by explaining why this is happening.
Thanks
Thanks