Noisy central heating system

[Meggalar]

Hi,
I recently drained down the central heating system and refilled including inhibitor. However since doing this a few weeks ago there seems to be lots of air in the pipework/hot water cylinder which is now very noisy.
I've been bleeding the radiators ever since but this doesn't seem to have made much difference.

I've had a similar problem before and an engineer removed the air by stopping the pump and open some type of bleed valve which is fairly high on the pipework above the pump.

Could someone please advise me what I should do to remove the air in the system?

Thanks
Richard

 

[HERTS P&D]

You have answered your own question:

"stop the pump and open some type of bleed valve which is fairly high on the pipework above the pump."

Turn off your heating system and bleed air vent in air-in cupboard.

Andy

 

[Meggalar]

Hi,
I tried to open the valve by turning the screw on the top but no air came out. I then took off the valve but no air came out either but i'm sure there must be air in the system still.

Apologies for the duplicate post, not sure how that happened.

Thanks