You may reset the check filter indicator by following the instructions below:

1. With the air purifier plugged in and the fan turned off, press and hold the Control Button for 3 seconds. This will turn on the red indicator light.
2. Press and hold the Control Button again for 3 seconds.
3. The red light will turn off when successfully reset.

If none of the instructions specified below were working, please contact Customer Support at customersupport@focusglobalinc.com.