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got hot water, boiler fires, but no heating?, pump seems to be fine also?

my boiler is firing and i have hot water recently had a new central heating pump installed which also seems to be fine BUT the radiators will not get hot. any ideas that may help. recently had a leak in the central heating pipes from a nail used for xmas decorations. this was repaired .
Andy, February 2008
thanks folks for your input its much appreciated it would appear the systems was infact airlocked.

Andy, February 2008
system could need balancing, to force water to the rads.or motorised valve could be faulty or a problem with your heating controls. could be a number of things. could be airlocked due to recent drain down.

carl, February 2008
check radiators have been vented properly

brian beattie, February 2008
check radiators have been vented properly

brian beattie, February 2008