There is a cloud icon at the bottom right of the touch screen, If the cloud is white and empty, it means the device is properly connected to the cloud.
If there is a red number inside the cloud (e.g “-6”), it means the device is not connected to the cloud.
Please look here to see what does each error code mean ( https://coolautomation.com/wp-content/uploads/sites/2/2021/03/CoolMasterNet_UM_v1.1.2-1.pdf)