Radiators - 3 work, 2 don't!

There is a small chance that the pipework could be simply air locked. Try shutting off the valves on the rads that do work. The theory being that the boiler / pump will push the air through to the affected rads. Then re bleed.

Disconnect the pipe work to these rads one at time and check if there is water to them . Remember the system will be under pressure so there will be no need to disconnect them completely from the radiator merely loosen the union nut. if there is water or any sign of pressure behind the pipes then it can be one of two things, the valves need replacing or the radiators are blocked. If there is not water out of the pipes then unfortunately the only option would be to replace the pipe work as it would indicate that the existing pipes are blocked with sludge.

Hi Sounds like new pipes required, as all above, they sound like they are solid, i use 15 mm for rads. Get 3 quotes from other plumbers to compare price.

when you power flush micro bore pipework all you do is move the sludge around and block the manifold its impossible to do a sufficient flush on 10mm and 8mm

Hi there, i have been on several jobs where other installers have installed 10mm pipe work that go through the entire house. I was working on on the otherday that had the same problem. 10 rads and 3 of them are not working. i did everything i could to get them working, even powerflushed they system. in the end, i installed new pipework fromt the boiler to the rads and they worked fine. i looked at the old pipes and saw that they were completely blocked. i couldnt believe it, so whenever i do new installations now i always try and use the biggest pipesize i can. I hope this is of some help to you Thanks Hassan

Which to are not working did he power flush right. Has he try to see if the Rad valves are working. I take it he has connected back to old pipe work

REPIPE NO PROBLEM 15MM MINIMUM TO ALL RADS