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how do i fix two rads that dont come on?

Hi,
i have a problem at home in which even with heating on full two of my 10 rads dont come on and one is the main large one in my living room area so i very cold in there.
I have bleed them both but still heat.
once in a blue moon they do come on but thats only been twice this winter alone.
my boiler is a new boiler(well a year and a half old) so that should be fine although he rads are older.
kind regards.
marc, December 2008
thanks both, i tryed them both and now my main rad is working thanks again

marc, December 2008
you might need to ajust the balance valve on them rads, its not hard to do , just googel it . ( balance valve on heating system , you will get the info there , on how to do it , mick

mick, December 2008
Could be airlocked Marc.Turn every other one in the house off and leave the 2 on by themselves.Sooner or later you should hear a gush and the air will be pushed out.IF this happens to one turn it off and let the whole syastem play on the other till the same thing happens.Then switch all the others back on probably not turning all the upstairs ones on quite as full as they can get warm with gravity circulation.

Tony S, December 2008