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Thank you kevplumb. i should amend that the rads are 19 years old and there are 8 of them. i guess they could be pretty well gummed up and worth replacing anyway despite using Fernox on a regular basis. However in answer to your thoughts, yes the loop is closed and disconnected, but as soon as...

I have a Vokera Linea 24 combi. Pressure keeps rising within the system ( central heating ) and vents at 3.0 bar. The expansion vessel is good with no leaks of any kind and the filling loop is ok too, all verified by a Vokera engineer. It has been suggested, by engineer, that this 2 year old...