E0 1: outdoor unit current protection. The reasons are voltage instability, compressor stuck, poor line contact and so on. The solution is to check the power supply voltage, replace the compressor and check the line connection.

E02: Outdoor unit exhaust temperature protection. The reasons are insufficient refrigerant, scaling of heat exchanger, non-rotation of fan, etc. Solutions include replenishing refrigerant, cleaning heat exchanger and checking fan capacity.

E03: Outdoor Unit under-voltage protection. The reasons are refrigerant leakage, low-voltage switch failure, motherboard failure and so on. The solution is to check the leakage point, replace the low-voltage switch and replace the motherboard.

E04: Outdoor unit high voltage protection. The reason is that the waterway is impassable, the high voltage switch fails, the motherboard fails and so on. The solution is to check the waterway system, replace the high voltage switch and replace the motherboard.

E05: Water flow protection. The reasons are pump failure, water flow switch failure, motherboard failure, etc. The solution is to check the pump capacitance, replace the water flow switch, and replace the motherboard.