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Hi all! I had a new Viessmann boiler installed in February this year, they preformed a full power flush etc according to the manufacturers instillation specification and the I staller was manufacturer approved. We've recently been using the boiler and it's making a whiring noise (kind of...

Hi all, I have a gravity fed system, I have removed a few radiators in the house to flush the sludge out as there were cold spots on them. I also did a full system flush with cleaner and with a preventer from Screwfix. The only thing now is trying to bleed the central heating pump. It is a...