Changing operating mode

Press key.
The operating mode LED lights up.

Press or key.
The operating mode LED lights up.

Press or key.
The operating mode LED on the ventilation unit lights up.
Heat recovery mode: orange LED flashes x times depending on ventilation level: Level 1 = 1 time... Level 5 = 5 times
Cross-ventilation mode: blue LED flashes x times, depending on ventilation level: Level 1 = 1 time... Level 5 = 5 times