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my radiators upstairs are hot but are cold downstairs?

my radiators upstairs are hot but are cold downstairs they were ok 2 days ago but now are not heating up ive bleed all radiators any thing i could try
darren, December 2009
Easy. The system needs to be balanced. Turn of all the rads. Then turn each one a full turn. wait a few minutes to to see which rad is still cold, then turn that one up another turn. do this all over the house until all are the same temp.

Peter Gale, December 2009