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Thanks for that. According to the manual, two of the reasons for F75 (no pressure rise on turning on the pump) are too little water in appliance or air in the heating system. I was hoping that the leaking magnaclean may have been causing this. When I get the service organised hopefully...

A couple of years ago but I'm arranging a service for the next few weeks. I would have thought that loss of water via the magnaclean would have had the same effect as a leak elsewhere in the system in that it would lose pressure?

Hi there, My first post... This thread has been very useful to me. I've been struggling with an intermittent F.75 on a Vaillant - it started about 6 months ago, around 5 years after fitting (this was an entirely new heating system). Each time the analogue pressure gauge was below the...