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Thanks for you help. Problem solved, it was sludge in the 15mm return pipes from ground and first floor curcuits where they common, just before they connect to the 22mm main return pipe. Was able to get the Fernnox DS 40 to ciculate around just one rad at a time, now the entire system is...

Hi Thanks Yes the black plastic screw is out, vent open. jspss

Hi Thanks there is an air vent at the cylinder it is an auto-vent ! Please any other ideas. jspss

Cental heating not circulating. My system is about 30 years old its has for most of it’s life had fernox inhibitor but perhaps only two lots over this time scale. No other problems in this time scale. It is a Y plan system pump flow to 3 port valve (diverter) extra 2 port zone valve in the...