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not all radiators are getting hot?

I have a hot water heating system heated with oil, and not all of my heaters are working. I tried to bleed each radiator, there is a bleeder on each radiator, maybe Iam doing it wrong.
edward closser, February 2006
close the ones off that are getting hot wait for the cold ones to warm up then open each radiator a little bit at a time untill radiators reach the same temp should solve the problem.

richard, March 2008
do you have a header tank or is it a pressurised system if pressurised you need to keep the pressure up to 1.5 bar when bleeding the system only do this when the system is not running

will, February 2006