As shown below:

1. The printed circuit board of the E1 outdoor unit is defective.

2. E3 high-voltage switch action.

3.E4 low pressure sensor works.

4. The E9 electronic expansion valve driving component is faulty.

5. Overfilling of F6 refrigerant.

6. The air thermistor (R1T) of the H9 outdoor unit is faulty.

7. The JBOY3 band exhaust pipe thermistor (R31~33T) is faulty.

8. The J5 suction pipe thermistor (R2T) is faulty.

9.J6 heat exchanger thermistor (R4T) is faulty.