A quick update. After turning the pump down, the radiators are all fine. No air in any of them, and the main one is no longer emptying.
Now I just have to see about replacing the inhibitor which was lost, but for now I am a happy bunny.
Thanks, once more, for the help/advice. :)
The boiler had to be moved because it was on the wall which was against the communal hallway, and the flue was deemed dangerous, so the new boiler was put on an inside wall, with a flue going out next to the kitchen window.
I'll take a look at the pump tomorrow.
Thank you, both. ☺
Right, it is vented. I have no loft because it is a flat. There are just two tanks - a black open top 'bucket-like' cold water tank directly above the copper cylinder.
I put a match to the air but it did not light.
Water does run from the overflow outside. Could this be why the radiator is...
Vented or sealed? Good question. I'll be honest and say I don't understand the difference. If you can tell me more about this, I'll try to answer as best I can.
My old boiler packed up and British Gas installed a new one. They moved it to the other side of the room, and had to move the water pipes. Apparently the position of the old one was no longer legal. Since then I have been having trouble with one of my radiators, having to bleed it daily.
On my...