I only bled the one rad I can get water out of all of them . from the boiler there are about five pipes all coming from the same side . one of the pipes has a red box called a super selector could this need adjusting?
I have just bled one of the rads in my house because it was cold at the top . I bled with the key and let the air out slowly (heating was still on ) . Since doing that a high pitched humming noise came from the pipes around the boiler unit. The rad is right next to the boiler and i have turned...