Cold rad and manifolds

[Ian Howe]

Narrowed down a cold rad to this manifold, are they prone to blocking or is it more likely the microbore?

 

[Gasmk1]

Could be blocked or the micro bore blocked. You could try putting some system cleaner in, and see if that helps. If not a drain down and remove and check manifold.

 

[Ian Howe]

Could be blocked or the micro bore blocked. You could try putting some system cleaner in, and see if that helps. If not a drain down and remove and check manifold.

Thanks for the reply, manifold feeds 3 rads and has 6 pipes so it has both feed and return?

 

[Ian Howe]

Well I never realised these manifolds have two chambers, one flow and one return, there was a slight blockage in one outlet, just enough to stop hot water reaching the rad.