So I need to drain down my central heating system so that I can replace a couple radiators and their trv’s.
My query is, when I come to refill the system is there anything to be mindful of regarding the boiler? Is it possible to get an airlock in there somehow? Can any damage be done to the boiler by not refilling/bleeding correctly?
The boiler is an 18 month old worcester greenstar 30si compact if that makes any difference.

‘Nut.

They probably have an automatic bleed valve inside the boiler, never worked on them, so I dont know. Put some new inhibitor in when you refill.

The previous owner left the manual behind for mine which had a simple to follow refill and bleed sequence detailed. Maybe search online for your boiler manual and you’ll find the same.