Fan Control Mode Buttons
The "HI" and "LO" mode buttons at the right side are used to select one of 4 fan speeds. Pushing "HI" mode button will raise the fan speed one setting; pushing "LO" mode button will lower it one setting.
There are 4 lighted Blue bars (between the "HI" and "LO" mode buttons) that indicate fan speed. When the bar above the "LO" mode button is lit, the fan will be running at low speed. When the bar below the "HI" mode button is lit the fan will be running at high speed.