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how do i bleed my central heating combi boiler and radiators?

i drained my system then refilled it ,the radiators upstairs are hot but downstairs they are cold.
have i missed something out?
steve, April 2005
could be an air lock.turn off all rads that are hot and see if the air lock clears.if the rads start working let run hot for 1 to 2 hours before opening upstairs rads again

darren stimpson, December 2005