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Thanks for your reply. No, the key isn't in at the moment, the boiler is on, there dosen't seem to be any water leakage or other problems, just the pressure gauge rising. By the way, when I turn the hot water on the pressure gauge does drop and then resumes it's previous level when turned of.

Can anyone help? I've read on the forums low pressure problems, however mine is going up slowly month by month. It is now showing 3bar (which is red). I was shown 1 year ago very quickly that I can insert a key underneath the boiler which can alter the pressure. Now does this work for it going...