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:D The system is open vented into the header tank and I have been bleeding the pump using the screw on the end of the pump and also upstairs radiators. Actually this morning I have found the problem. The ball cock in the header tank was stuck as it probably hasn't moved for some time. Now I can...

My CH system was working fine until I replaced a radiator after decorating. Now I can't seem to get all the air out the system. The pump continually needs bleeding to get it going properly.