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Thanks tony, That could true, I'm not sure if the boiler was flushed. I did install a adey magnaclean filter to protect my boiler though. As I mentioned in a previous post, the boiler was installed before I bought my home, and it seemed very unlikely that the system was flushed at point of...

Thank for response, The boiler was installed by the previous owners, in 2007. Point taken I wouldn't open anything on my boiler. The expansion vessel has been added already but has not fixed the problem.

I'm getting a f75 error on my vaillant Eco tec plus boiler. To get around the error, I have been draining some water out of the system, and then adding pressure via the filling loop. This gets around the error but then after a day or two the f75 returns. I do have British gas home care, I...