Yes its a common problem. First tie a bag over the pressure relief pipe [should go to outside] to see if the water is leaking from the valve. If it is, then, inside the boiler, the expansion vessel [red] has an air valve like a car tyre valve. Take the cap off and press the valve. If you get water the expansion vessel is U/S and needs to be changed. If you get nothing or just a little air then pump it up to .75bar with a bike pump. You will need to change the pressure relief valve if it has been opened.
triffid
February 2011
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