[quote author=thescruff link=1102617868/0#2 date=1102630057]Suspect the system is out of balance, [/quote]
Nope, no rad valve has been touched in three years
Quote:blocked cold feed,
possibly, but once bled the system fills again so there is water getting into the system from the cold water tank.
Quote:valve fitted wrong,
Possibly, but it was working properly immediately after it was replaced at the begining of the year.
Quote:pump on the wrong setting.
Possibly since the motor might have been fiddled with when the valve was changed, but the system had no bleeding problem (sorry about the swearing!
) immediately after the valve replacement and none till 2 months ago.
Quote:more info on type of system required.
It's a condensing boiler feeding the CH system. Not a combi boiler since the hot water is stored in a hot water tank. No TRVs on the rads. The pump's setting is set to 2. Pump is a Grundfos Selectric UPS 15-50. Anything else you need to know, let me know.