If the drive wheel of the Xiaomi Robot Vacuum S40C is not working properly, please refer to the following steps to troubleshooting:
1. Check whether there is any debris or tangled hair in or around the drive wheel and its components;
2. If the drive wheel is too dirty, it can affect traction. Use a brush to clean the drive wheel thoroughly;
3. Restart the device and test it again;
4. Check the robot vacuum for any visible signs of physical damage that affects its functionality.
If the above steps cannot resolve the issue, please contact the local after-sales service center for further assistance.