DIAGNOSIS The unit is in Auto mode. In Auto mode, the fan speed adjusts automatically based on the air quality sensor reading.
FIX Press the 'Fan Speed' button until the desired speed (1-4) is selected and the 'Auto' LED is off. The unit will now maintain that manual speed.
IF THAT DIDN'T WORK Check if the 'Smart Mode' (crescent moon icon) is activated. This mode lowers speed automatically in dark conditions. Press the Smart Mode button to turn it off.
HEADS UP In Auto mode, a blue air quality light corresponds to lower fan speeds. Red or orange lights trigger higher speeds.