If the drive wheel of the Xiaomi Robot Vacuum H40 is not working properly, try the following:
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. Check if the robot is placed on a flat, stable surface, as uneven flooring or objects underneath can cause the drive wheels to malfunction or misalign;
4. Manually rotate the drive wheels to ensure they move freely without resistance or abnormal noise, which can indicate internal mechanical issues;
5. Power cycle the robot vacuum by restarting it, then check if the issue is resolved.