We've got a new 40CDi and this is the first time I've tried to refill it. Not as easy as the filling loop on my old Isar.
Just reconnected a couple of radiators and refilled them. The CH pressure gauge dropped to zero, naturally, so I used the plastic key and plastic screw to refill the bolier to just over 1 bar (where it had been before I started playing around with it).
Now the DHW works fine, but when I try to get the heating going the temperate on the display (DHW temperature, I believe) starts falling. When it gets to ~30 a fault flashes on the display that looks a bit like a rugby goal (i.e. l- -l ). Sod's law I can't find that one in the manual.
Other information from when I was filling: It took a while for the CH pressure gauge to rise from zero, but once it started it got up to 1 bar as quickly as I'd expect. Likely at least partly due to me being cautious about opening the valve. The other unexpected event was the boiler fired up on the hot water side whilst being filled (no taps on). I stopped filling, waited until it had finished then started again.