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If i don't top it up it just rises from from say 0.9 to 1.0 and stays there. Some one has suggested it could take up to 2 x weeks for the system to stabilize if you keep topping up and bleeding the system.

Tried that Kevplumb and seems to be ok. If it does it again could this mean a leak somewhere in system

Recently i have been setting the pressure @ 1.4 bar on my boiler when it is running. As soon as it turns off (water/heating) it drops to 0.8/0.9 bar. When it starts up again i have to repressurise it to 1.4 bar again. Any ideas.