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Well I tried all sorts, and am still at the same state as before.I have tried what you said and ended up with none of the radiators working,so I bought a sludge remover,and I now still have the downstairs 3 working but not the upstairs.I am going to take the radiators off and flush them through...

I ll try that and see if it works,getting too cold upstairs now.

What would be the remedy for any sort of blockage,will i have to drain again and refill the system.Sorry if I seam a bit dumb,but new to this.

I take it the centre screw is in the pump? The pump works for the downstairs rads,but doesn't heat the upstairs.

I drained the system fully and then when it was filled I bled all the radiators.So no air now,but no heat in the upstairs.

anyone??

I have a parkray fire but have problems with my radiators.The upstairs,of which there is 3 and on gravity feed are all cold,even with the pump on they dont work,any ideas.I have drained the system and still no results.The pump works for the downstairs ones but all the upstairs are cold.