Bleeding a radiator - noob quesiton

[ChemicalChaos]

Hi all,

I need to bleed a radiator in my house, I have looked online for instructions and it says "turn the central heating off first". Am I right in thinking that just means that you cant bleed it whilst the heating is circulating (which would of course be dumb), or does it mean you actually have to switch the boiler off even if it is not currently in a central heating cycle? (Doing so will mess up the programming and I dont have the codes to reset it)

[ChemicalChaos]

Thanks chaps

[ChemicalChaos]

How do i tell if its an open or closed system? Its a student house and I dont know much about the boiler (hence why not wanting to have to switch it off!)

[ChemicalChaos]

I tried to do a boiler selfie, but it didnt work so here's the best I could do. its not a combi system as we have a hot water tank upstairs:

[ChemicalChaos]

[ChemicalChaos]

Hi chaps, sorry to forget about this thread but it was the day before I broke up

I attempted to bleed them using a socket set, then a pair of pliers, before admitting defeat and realising I need to buy a drain key. One has been ordered and is in the post to the house, so I will do it and keep you updated on heat output effect when I return in early January