I think I found a bug in IRCv2 (v10.0.9.24).
I have set up IRCv2 with comfort temp (Tc) coming from a constant and mode (M) through logic (M = 1, heating). If I now press the + / - buttons on the UI (tried it on iOS and web), neither the target temperature (AQt) nor the UI reflects any change but the valve output (Qh) increases (even when trying to decrease the temp!).
I remember that I was able to use the UI to alter the target temperature.
Anyone seeing this bug?