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Just to ask the question in another way, does anyone think that the leak I spot from the boiler when the central heating comes on result in the pressure loss? Also the upstairs rads are filling with air, I take it thats because the water has to be replaced by something? The water is running...

I wouldn't have the first clue how to fix it though. Would that also allow air into the system as I have noticed a small amount of air coming out of an upstairs radiator? I take it I am right in thinking that would be a sufficient leak and I haven't got a problem in the pipework? Cheers

Hi all, I have been dropping pressure for the last 2 months approx 0.1 bar / day. Recently this has increased to as much as 0.3bar. I took the casing off the boiler and saw water marks underneath the chamber. When the central heating comes on there is a steady drip from the fan. Could this...