F1, F2, night mode, and the jets icon are straightforward.
It's the "Ready" and circulation arrows that have no specific mention in the manual.
I'm guessing "Ready" means no heat demand?
What about the two arrows, like below (but in red of course)? In the bottom right of the display. I've seen them on with F1/F2 and also without, haven't figured them out. Thanks!
