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How can I fix my radiator (Valiant system, combi boiler)?

Two weeks ago one of the radiators in my house stopped working. I bled it but it is still not working. Today a second one has stopped working. Again, I have bled it but it has made no difference. Other than these two the rest of the radiators in the house are fine. Any ideas what the problem might be?
Matt Smith, March 2008
are your valves thermostatic ones?. if they are put them on full then remove the heads by turning the ring underneath the heads might be faulty iv come across this problem before.

craig, April 2008
Possibly air locked or they could be add ons, extension etc etc. try closing the other rads in the house then stick the heating on and see if it forces the water round them. if it does, open the rest up one by one and just open them half way but leaving the problem ones open full. see if that helps.

iain, March 2008