hi
when my hot water is running. or the heating is switched on the preassure goes up and water comes out of my overflow. i have to turn the releif valve to get preassure back down. this is getting a daily acurance. what is wrong?

tony, August 2008

Either, the filling loop is not completely closed water mains water is entering the central heating, or the expansion tank needs re-pressurising. I posted a detailed "how to do this" yesterday, have a look for"optima 701 pressure rises"
not sure if the links works but it should be on
http://www.howtomendit.com/answers.php?id=163192

LTGF, August 2008