I am not sure if this is an intentional feature or not - if it is then it seems a little foolish, and prone to problems - but a friend discovered that if you press the free flow and large 2 cup button on the left hand group of a three group FB80 it immediately switches the machine off immediately.
(I made a stupid video about it here
I've seen this happen many times in barista competitions but no one has understood why the machine has gone off, because usually you'd push and hold off for 3-5 seconds - and no one has seen the barista do that.
Does this happen on other machines? Other 2 groups? Did people already know about this?