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hi guys I've got a system thats giving hot water but no central heating. if i push the 3 port valve lever to manuel it works for a little while then stops again. is it my 3 port valve thanks

Hey everyone This is my first ever post on this web site. BIT OF BACKGROUND!!!! I was very interested in solar water heating and really fancied having some fitted to my house...Looked around a little and selected a company to install after a bit of hard sell from them......You know if...