I have a Modena 80E boiler and the pressure drops on the sealed system. I top it up to 1bar as the manual says but within days it has dropped. I have checked every pipe I can dfind on the radiator system but have found no leaks. I cannot hear water dripping anywhere and there are no stains appearing on the cieling from leaks that I cannot see. Any suggestions on what it could be or how to find the leak

Michael from Risca, December 2010

check pipe from pressure relief valve it usually goes through the wall to the outside near the boiler

brian, December 2010