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Hi, just had a new kitchen radiator fitted to a combi system, tee'ed off from 22mm flow and return near boiler. Run is 22 to 15 to 10mm and is about 10-15metres long with a vertical drop and rise to radiator. Pipes were clear before connecting, valves are both open. Radiator is stone cold...

I have a glow worm swift flow combi that seems to be experiencing pressure problems :( . The pressure reading is normally around .75 after a top up, but recently drops to around .3 after CH use. The pressure remains stable when CH not in use (or cold) and I've checked for leaks --not finding...