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Many thanks for your help. I suspected that this was the case and was intending to try and fit an air bleed valve next. Alec

I have just had a new wall-mounted boiler (glowwrom micron 50ff) fitted and I interfaced the pipework to my existing system (having replaced a back boiler). I have fitted the cold feed and the expansion pipe in the flow, close together , before the pump. This then feeds a three-port valve, one...