in doubt you really do just have to start flicking things :OD
This is my bedroom methodology.
This one was a switch inside the casing, so not a user accessible one. Something for the installers only it seems.
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Hehe, yup!
Yeah, that's a truly weird thing. My new boiler has the preferred for adding water to it inside and under the casing. I said to the guy, how can I do it myself now when I bleed the radiators and he was like, you can't.
FFS!