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ok thanks I have a look, can you confirm where the valve loop is not that technical?!! :(

I will check the loop tonight but this is happening when the boiler is cold

Hi Ever since we had a thunderstorm last week, the pressure guage on my boiler has gone from the green band when cold to number 3. We have drained the water out the radiator untill it goes back to the green band but as soon as I finish it goes back up to number 3 within 5 mins! I have been...