When you have COMPACT AIR II you use the push-button code. You start by opening the door. You then press RES when the alarm appears on the display.
1. Press and hold button 4 for 6 seconds.
2. Press button 2 for 1 second, without releasing button 4.
3. Press and hold button 4 for a further 8 seconds until SERVICE MODE appears on the display.
4. Release the button.
You now have four choices:
N1 – Return to the Main menu
N2 – Installation menu
N3 – Operating info with times and duct/filter calibration
N4 – Manual test and calibration