If the Xiaomi Robot Vacuum S40 Pro reports a side brush error, please refer to the following steps to troubleshoot:
Remove the side brush and check for any foreign objects or hair entangled in the brush or its components.
Try restarting the robot vacuum and see if the issue is resolved.
Check that the side brush is installed correctly and securely attached to the robot vacuum.
Inspect the side brush for wear or damage, replace it if the bristles are worn down or bent.
Update the firmware via the Xiaomi Home App to ensure the latest performance and bug fixes.
If the side brush error persists after these steps, contact after-sales service for further assistance.