central heating always needs bleeding

[homeguy30]

every two weeks my central heating system needs bleeding. i,ve checked all round there is no visable leeks unless in the concrete floor can anyone suggest what to do next

 

[stevetheplumber]

every two weeks my central heating system needs bleeding. i,ve checked all round there is no visable leeks unless in the concrete floor can anyone suggest what to do next

sealed system or open vent ?

 

[homeguy30]

its open vented system

 

[GreenArmy]

Blocked cold feed?

 

[homeguy30]

how do i over come this is there a easy way to sort this out

 

[stevetheplumber]

how do i over come this is there a easy way to sort this out

to prove it drain down and see if the header tank stays full
if its blocked it will probably need cutting out and replacinghappens most on the inverted section and on air seperators