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Cheers, thanks for the info.Regards

I looked at the link page, and had come to the conclusion that I would have to start cutting on "tees" and "bends" from the header down, I just hope that I find the offending section quickly. Many thanks for your help and advice.

Thanks for link, will give some of those methods a try.

Unable to find any article in forum to assist with this problem. I have bought a sludge remover, emptied water from header tank, but obviously cannot put into system because feed pipe full of water from Blockage back to header tank, any suggestions on how to clear this blockage.

Thanks for info. Will look through forum as you suggest

Upstairs rads cold, yet each upstairs rad will get hot if ALL rads in house are turned off(both valves).and each individual radiator is then bled (With difficulty). No air or water will come out of the upstairs rads when system is switched off, no problem with the downstairs. Pump works fine...