no heat downstairs?

in what way did you balance rads?did you throttle down the lock shield valves?sometimes these valves need to be almost closed to force water downstairs,start at hottest rads and close lockshield valve completely then crack open 1/4 turn until heat is felt coming through pipes and ensure all downstairs rads are fully open,is there a bypass fitted between flow and return?check it isn't open too far,if it's an old system then try system flush.all the gunk will collect in lower rads so might just need cleaned out

steeveepee
November 2008