I have a Vaillant TCW Sine T3W combi-boiler connected to a closed heating
system. I have removed the radiator at the end of the system in order to
reposition it.
I am trying to drain the system via a stop valve which is located below the
boiler (the boiler is housed in an upstairs room) but no water is coming from
the valve when it is opened.
Can anyone offer any advice as to how I can drain the system?
Many thanks