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Central heating system not working right.I have had british gas guy out rads down stairs not getting hot upstairs was shut them down bottom rads got warm but after period of time some went cold again ,also kettleing sound from boiler says its down to poor circulation due to pipes being blocked...

seems to be air in central heating ,could leaking rad valves draw air in when working.

has anyone got an idea? rads upstairs getting warm downstairs cold . turned off upstairs ,downstairs warm but valves upstairs seem to weep a little from valve and when you stop pump you hear bubbles rising in pipes . tryed reduceing flow in hotter rads but when all open goes back to hot upstairs...

Has anybody come across same problem as i have. Just moved into new house central heating playing up,rads upstairs getting hot downstairs cold.Had corgi reg guy out changed control switch new three way valve and new pump drained the system and filled it from bottom rad but had rads warm not red...