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Thanks again for the interest and advice. Latest update from icers in bristol is that the AAV was sticking, had pro plumber strip it down. AAV full of black greasy gunk, showed him size and quantity of collected residue from flusjing system. In his words "would expect that from a 20 year...

ChrisR Thanks for your response, water is ok, sits between 1 and 1.5 bar. Have located AAV, the plastic cap is loose. could the fault lie within the AAV and if so can they be stripped down and cleaned Cheers

I am after some advice and guidance. I have an ecomax 635 hooked up to a unistor cylinder. I have a ground floor flat with 9 rads and under floor heating. System has always struggled to supply heat to last rad but has managed some warming. In trying to improve the heat from the last rad i...