Why is my air purifier beeping?

The air purifier may need to be reset if there is a loud noise while it is on. Ensure the air purifier is turned off by plugging it in. For 3 seconds, press and hold the reset button. The light will turn off when the filter reset button is released.A beep sound while the air purifier is in place may indicate that the device has to be reset. Connect or air purifier and make sure to disable. Press or reset filter button for 3 seconds. Remove or reset filter button and lamp, indicating that the reset is completed.