Mill Silent Pro Compact air purifier (Model: APSILENTCO) Turn off deviceTurn device onPress and hold Fan speed/Mode button for 20 secondsOnce 20 seconds have passed release button and hard reset will initiateAll icons blinks 3 times.Related ArticlesReset Mill Silent Pro?What do the lights and symbols on the control panel mean?What are the differences between the Silent Pro and Silent Pro Compact air purifiers?Where can I find the model number/serial number of my device?Mill Silent Pro Air Purifier - English EU user manual