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Thanks for the help, doesn't look like it's a quick fix then. Sometimes when I bled the radiators, nothing would come out, then after this fact, bleeding it again, air would come out followed by water as usual, would this be consistent with a blockage? Also what would cause the boiler to...

Radiators bled with the system/pump off and the header tank has water in it. Would it immediately stop working after I bled the radiators as above if there was a blockage? as that's when the boiler stops firing. The pump continues to run after the boiler fails to fire, and the pump seems...

Hi there. I'm having a bit of trouble, the radiators became quite noisy when the heating was on and needed bleeding, which was done, they were still a little noisy but settled down a bit after a while. But now the two radiators upstairs are only half heated (the bottom half), indicating...