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i give up,tried balancing,closing off all the upstairs rads,then all downstairs become hot(so don't think its blockage)turn on 1 rad upstairs and all downstairs go cold within minutes,tried balancing,had trvs off pump running at speed 3 or 2.very hot water gushes out down stairs rads(indicates...

ive read all the answers to the cold radiators down stairs syndrome,and ive tried everything and im totally baffeled.all rads downstairs cold.some on the old micro bore plastic some modified onto 15mm bore plastic still nothing all except 2 rads have the trvs.bathroom rad has 15mm copper pipes...