Hi all ive recently had a new combi boiler installed after the 32 year old pottertern boiler died on us. Everything has been fine and the pressure has been around the 2 bar mark but its been dropping gradually over the last few days but its now at 0, everything still works allthough the radiators arent that hot and the boiler has become more noisey and I can hear the sound of water trickleing around the pipes but no signs of a leak anywhere. Here is a pic of under the boiler so I can show you the valvles that I have as I need to know which ones I need to turn to get the pressure back up. Any help will be appriciated thx Arran