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Ok thanks again to you all ! The downstairs feed is 22mm copper so the microbore must be Teed from this!

Thanks for the info just taken off a downstairs radiator and flushed it, moderately black sludge inside. When I re attached it I closed all the other downstairs radiators and tried to force the heat through the cleaned radiator but nothing no even getting slightly hot. Where should I go from...

So a big thanks for all your ideas! 're flushed and back filled with a garden hose mostly all works still clear water comes out. The main thing is absolutely nothing to ground floor. So radiator off and flush I through . So much more liky Muck rather than a valve. Difficult to remove radiator so...

No I was just trying to be clear as the water was. I might take a downstairs radiator off tomorrow and just see what happens ie any sign of sludge does the water flow easily from the valves ? put a hose in the radiator to see if water flows easily through it. I am clutching at straws but hey ho...

fairly clean inside put water from draining in a beer glass looked pretty clean. ie if it had been offered as a drink of water it would have passed

Yes just 3 settings manually operated by a rotary switch same as previous pump

The system had been left off for 10 months and the pump refused to come on this is why I changed it

If you turn off the working radiators they go cold!

The pump pumps downwards !

Hi thanks again is this the valve in the middle of the pic . I have bled it !

Just recheckd pump direction it's the same as before

So I re drained the system the water was clear no bits in it. Re filled with all em valves open bled the radiators still the same problem the house has 3 floors an em valve for each plus one for the hot water. So in the picture directly opposite the pump is the middle floor which works fine. On...

Hi many thanks for getting back , air in the system could be a problem I guess, So I drained down the system from a valve at the lowest point in the system in order to install the new pump. (I am not an expert of course ) The system refills when I turn the water back on. I have bled all...

Hi all just changed the pump on my fully pumped system it was a like for like pump. System has 2 zones upstairs and down stairs. Turned it on pump works fine and upstairs works fine but downstairs doesn't come on at all . I opened the downstairs em valve manually but it still won't come on! In...