Radiators not heating

[Bubbauk]

Hey everyone, since draining and refilling my central heating system 2 of my radiators are not heating correctly although I cant be sure that they were heating before as I have not lived here all that long so could be that I have only noticed it, It is oil fired central heating and the 2 radiators that are not heating are both downstairs and furthest away from the boiler they have a very very small amount of heat in them and I mean small, all radiators have been bled so I am pretty sure there is no air in the radiators.

Any help would be appreciated.

David.

 

[D_Hailsham]

Turn off all the rads which do get hot. If the two problem rads now get hot, the problem is due to the system being out of balance, i.e. the rads are not getting the correct flow though them.

Read How to balance a CH system

 

[Bubbauk]

Cheers for that, just tried turning all the other radiators off and those 2 are heating up, will get the thermometers at the weekend and give this a go.

Thanks.