Reasons for low pressure in refrigeration and air conditioning systems

Common causes of low-pressure failure of air conditioners are:

1. The copper pipe of the air conditioning refrigeration system is too long.
2. The filter of the air conditioning indoor unit is dirty and blocked.
3. The dry filter in the air conditioning refrigeration system is dirty and blocked or the copper pipe is blocked by oil.
4. The low-pressure protector in the air conditioning refrigeration system is faulty.
5. The solenoid valve in the air conditioning refrigeration system cannot be opened.
6. The expansion valve in the air conditioning refrigeration system is faulty.
7. The refrigerant in the air conditioning refrigeration system leaks.
8. The heat dissipation effect of the condenser of the air conditioning refrigeration system is too good.
9. The return liquid pipe in the air conditioning refrigeration system is flattened, resulting in poor return liquid.