The code indication changes as shown below, and notifies with a long beep. E1 Outdoor Pcb Error E3 High Pressure Protection E4 Low Pressure Protection E5 Compressor Motor Lock/Compressor Overloaded E6 Compressor Start-up Error E7 Outdoor Dc Fan Motor Lock E8 Ac Input Over Current E9 Exv Errorea 4 Way Valve Error F3 Discharge Pipe