Radiators need bleeding every couple of weeks

[tedson]

Hi, my radiators need bleeding every couple of weeks. I have a open vented system. Where and how could the air be entering the system? And how could I stop this happening?
Many thanks

 

[mcmoby69]

pump could be dragging air down the expansion. this is caused by restriction in the circuits due to build up of sludge affecting the normal circulation of the heating system. also the boiler could be 'kettling' causing bubbles to form in the pipework. also there could be a build up of bacteria in the heating system causing 'air'. this 'air' could actually be hydrogen and is flammable! if you are adventurous you could try holding a lighter to the vent on the rad when you bleed it and see what happens!

 

[ajepo]

Hi there, it sounds about right, i suspected that your pump mabe sited in the wroung place,.. Is this a new problem to you ,or have you had any work done on the pump or pipework?