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Hi, Firstly, I am neither plumber nor heating engineer, just a willing diy, have a go guy. I have a Grant 26 oil fired combi boiler which started continually leaking water from the prv to the outside. The pressure was at 1 bar until the heating system cut in, when it would increase to 2.5 and...

I had a GRANT oil combi boiler 26 fitted three years ago as a replacement for a 10 year old, failing equivalent. Up until recently [approx. 2 weeks ago now] it has performed faultlessly. Now, since the guarantee has expired, the boiler has decided to 'kick off.' I checked the obvious first then...