2 Rads not heating up

[spinnerc41]

I have 2 downstairs radiators not heating up. The system was recently power flushed, the plumber highlighted a flow issue, I have removed the radiator and flushed it, after refitting still no flow until I turned off all other radiators in the house then they both warmed up great I thought. As soon as I opened up valves on the other rad's no heat again I have added Adey MC3 for the last 3 weeks and flushed the system still no joy what can I try next?

 

[SJB060685]

Hi.

First off as you're a new member your posts will need to be verified before we see them, so please be patient for any further responses from myself or others.

Would you say the two problem radiators are furthest from the boiler?
When you say the system was power flushed do you mean a genuine power flush with a machine or just inhibitors added to the system?
The pump when spinning acts as a magnet for the black magnetite, its quite possible there is still some sludge lodged in the impeller which will affect its operation. You could try increasing the pump setting to see if it generates enough head to circulate around the system.

 

[steadyon]

Sounds as if it could be a balancing issue. There are a good number of internet guides on how to balance the system.

 

[SJB060685]

Sounds as if it could be a balancing issue. There are a good number of internet guides on how to balance the system.

Could very well be a balancing issue yes. I said the above assuming this was a new problem, of course I could be wrong if this is an ongoing problem

 

[steadyon]

SJB060685 - Could be a new issue if the people doing the power flush closed all the valves and didn't re-open the lockshields to their previous positions.