I have a Heat Pump controller, but nothing as fancy as this. It has a clock button, which one holds in for a few seconds, and the hours start blinking.
Try holding the timer button in for a few secs, and see what starts blinking. Then press "Timer" again. I hope that the blinking will move to the next settings, and hopefully it will get to the time hours and minutes, which you can adjust with the up and down arrows.
Do tell what model it is, where to get, etc..