2 cold radiators

[chrisogreero1]

Hi there ,
I have a potterton suprima 30 boiler. As I understand it on a fully pumped system supplying 9 radiators and hot water for my bungalow on a small bore system{pipes about thickness of litle finger at rads}. After draining and refilling the system I had a lot of banging from the boiler but that has now cleared. However Find that the 2 furthest radiators remain cold and that the boiler keeps cutting out on overheat . The pump in the loft seems a little suspect but on its high setting and by use of the bleed screw seem to be able to coax it a little bit. Tried switching off the rads that work ok so as to divert water to the blocked / airlocked rads. And also flushing the rads by removing / opening the bottom drain near control valve on radiator and also bleeding all rads{with system off but still have 2 far rads not heating}. The system is about 10 yrs old and has a significant amount of corrosion

What would you reccomend I try next?

 

[bathjobby]

Take the inop rads off and flush, check that water runs out of the flow and return pipes to those rads, if not, flush those pipes too.

 

[chrisogreero1]

Hi there,
Thanks for the advice. I managed to clear the flow eventualy by turning off working rads..... But had further problems with the pump so after much ado replaced it and then everything has worked just fine.
Thanks again best regards,
Chriso