Hi, I have a worcester 240 combi boiler that is loseing pressure whilst boiler not running. To start the tale it developed a leak from the 3 way valve last week, I took the covers of and realised where water was coming from, ordered part and fitted it myself. I re-pressurised the system etc. got it up and running and thought that was the end of my problems, turned the thermostat down when going to bed as usual and next morning pressure on gauge had dropped to zero!! Repressurised the system turned thermostat back up and heating and water perfect again, thought maybe air in system until I realised every time thermostat turned down and boiler not running for any longer than about an hour it losses all pressure. When i pressurise system I put it to 1 bar, when boiler running it raises to approx 2 - 2.5 bar and as i say when switched off it losses all pressure between half hour til an hour. I did see the outside drain dripping one morning a couple of days ago when boiler was running but just been outside and checked it and not dripping now and boiler been running about 2 and a half hours. After fitting 3 way valve is ther any special way of bleeding system? as all radiators hot and doesnt appear to have air in them. Any help or suggestions would be appreciated.
Thanks in advance, Ashley
Thanks in advance, Ashley