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The pressure doesn't rise more than 0.2 bar when it's hot, and when it's at 1 bar it can stay like that for a very long time until suddenly it'll just start dropping at 0.2 bar per hour usually middle of night or early morning

Not sure, but the PRV was dry when the installer came to check yesterday...Also the pressure didn't drop when the boiler was isolated

That's what the installer and heating engineer both think, just the hassle I suppose! But what I don't understand is why is the pressure dropping when it's cold and not when it's hot??? Surely if I have a leak it'll leak even when it's hot???

Hi hope somebody can help! We've had our open system boiler upgraded to a Viessmann Vitodens 050 combi back in August last year. When we had the heating on the first time in November when the thermostat was set to 20℃. After giving birth and having parents coming from the far east to help out...