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Nige, Take your point about getting the Installer Back. Reason I mentioned the Inhibitor is that I assumed that the air in system would not be caused by hydrogen from corrosion. Is it possible he could be drawing air in through a joint without showing any sign of a leak, probably should...

A mate of mine has been discussing problems with his CH and we all are a little stumped. He recently had a new boiler fitted and new radiators throughout, the system was flushed prior to installation of the new boiler and a large percentage of the pipework was also replaced. Each new...