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loss of pressure?

ihave a netaheat gas boiler--------the pressure release valve returns to zero when i switch off and i have to top up the system! it then goes up to 3 bar pressure but if i leave it running it slowly slips back to zero-whats up? i have checked for leaks but cant find any-help
bill chambers, November 2005
is it leaking outside from the overflow? it may be your pressure return valve

Neil corbett, March 2007
youve got a leak sunshine!!!!!!!!!!!

johnny plummer, October 2006