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greenstar 30cdi pressure ?

should the pressure drop when the system is not running,then go up to 1.5bar when heating? or should it be 1.5bar even when its not running? Thanks
confused, December 2010
I have had exactly the same problem I have just had worcestor out today, and there was a hole in the Expansion Vessel. My Boiler is 2 years old.

Jane, January 2011
should be about 1.5 bar al the time, when heating on it will rise a bit abour 1/4 of a bar.
hope this helps

erj, December 2010