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@s.walrus
Both ends of that loop have a valve, one has the knob, the others needs a screwdriver to open it. You need to open both to re-presurise the heating system.
Dammit, is right that the loop is not meant to be left on (all the manual say this), but I've never seen a boiler without it left on, and plumbers always expect to find them.
Hope this is just repeating what has already been said.
Edit:
Ah! looking at the wrong picture. No loop on the sick boiler.
Will need a plumber/friend with a spare loop and a clue.