Use the on/off button to turn the Heat pump on or off fan ⬇️ or fan ⬆️ Increases or decreases the fan speed. the mode button changes the mode, to lower the room temp first change the mode to cool/ To raise the room temp first change to heat and raise the set temp. The green buttons are smart load control mode 1 is less energy 2 is normal mode and 3 is the fastest reaction to external condition changes