Multi-split operation and maintenance system

The invention discloses a multi-split operation and maintenance system. The multi-split operation and maintenance system comprises a cloud platform and a network connector. The cloud platform comprises a user service system and an operation and maintenance management system communicating with the user service system, the user service system receives fault information, about refrigerant noise, fed back by a user, and the operation and maintenance management system issues a control adjusting instruction according to the fault information. The network connector communicates with the cloud platform and an outdoor unit of an air conditioner. The cloud platform issues the control adjusting instruction to the outdoor unit through the network connector. The control adjusting instruction is used for adjusting the opening degree of an electronic expansion valve of each indoor unit which stops running, so that the refrigerant noise is reduced. By means of the multi-split operation and maintenance system, the fault infor