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Common causes for low-voltage faults of air conditioners are as follows:

1, air conditioning refrigeration system copper pipe is too long.

2. The air conditioning indoor unit filter is dirty and blocked.

3. The filter dryer in the air conditioning refrigeration system is dirty and blocked or the oil in the copper pipe is blocked.

4. The low pressure protector in the air conditioning refrigeration system is faulty.

5. The solenoid valve in the air conditioning refrigeration system can not be opened.

6. The expansion valve in the air conditioning refrigeration system is faulty.

7. Refrigerant leakage in the air conditioning refrigeration system.

8, air conditioning refrigeration system condenser heat dissipation effect is too good.

9. The liquid return pipe in the air conditioning refrigeration system is flattened, resulting in the liquid return is not smooth.