Step 1: Plug in the power, re-water and power on for 3 seconds to reset.
Step 2:
If the filter life indicator is flashing, press and hold the "Reset" button for 3 seconds until the filter indicator light stops flashing.
If the filter indicator light is not flashing to indicate expiration, you need to reset the corresponding filter. Press and hold the reset button, then press to switch (for the filter that needs to be reset), then press and hold the reset button for 3 seconds.