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Can anyone help with the best way to flush the pipework?

Yes my system is as described. The valve is the 3 way diverter valve but i didn't think this had a bleed on it? I checked the tank in the loft, the ballcock is working fine and there is water in it

excuse my lack of knowledge, where would i find the 3 port valve? Yes all radiators bled fine apart from the three i had been having the problems with upstairs.

I have read elsewhere also that you have to balance the system. I think I may have to do this after the above problem has been rectified. How would i best do this. I have TRV's on most of the rads does this make a difference?

I think the valve thread inside may have corroded and sheared as did a couple of mine. Unfortunately they will no longer move position and will require replacement. Not expensive but draining the system is a pain in the a***

Hope someone can help! I have a pumped system and have recently fitted a new pump which didn't seem to cure the problem as the 3 Rads upstairs are still cold including the connecting pipes. After draining them they didn't seem to refill. I left the bleed valves out and gave the pump a whirl...