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I have had a few problems with my heating lately and have just got my central heating working and 3 of my rads are nice and hot but the 2 on the other side of the flat are cold... i have bled them but still they stay cold.. any help would be great

fitted a new filling loop and job done so thanks to you all for pointing me in the right direction but now i have another problem where 2 of the rads are cold after bleeding and the other 3 are nice and hot any ideas

i have taken the filling loop pipe of and open the filling tap and the water is getting that far but not into the vessel and the gauge still says zero and im not seeing any other leaks??

and my filling loop looks similar to that one just that it has 1 filling tap on it

its a seperate expansion vessel not in the boiler the gauge works as i turned the relief valve and it zeroed out and im getting water to the vessel but it just wont fill up and all the pipes around the zone valves are getting warm but im thinking that because there aint enough water in the...

thanks for that but why wont the expansion vessel refill even when i open up the water in valve on the filling loop the gauge just stays at zero

i am having a problem with my central heating and have noticed that my vessel pressure is nearly at 0 and i have tried to refill via the filling loop but it wont refill could it be a faulty vessel any ideas please