Here are instructions for how to reset air purifiers Mill Silent Pro Air purifier (Model: APSILENTPRO) Turn off deviceTurn device onWithin 10 seconds, press and hold [MODE] for 10 seconds. This will perform a hard reset on the device Related ArticlesWhat do the lights and symbols on the control panel mean?Where can I find the model number/serial number of my device?I have changed my network at home. How do I reconnect my devices?Mill Silent Pro Air Purifier - English EU user manualReset - Mill Silent Pro Compact