If the side brush of the Xiaomi Robot Vacuum H40 reports an error, please refer to the following:
1. First, power off the device and carefully remove the side brush by pulling it upwards;
2. Inspect the side brush and its surrounding components for any tangled hair, threads, or debris that can be obstructing movement. Remove any buildup gently;
3. Check the side brush and motor area for dust or blockage that can cause the error;
4. After cleaning, securely reinstall the side brush into its proper position.
5. Restart the robot vacuum and observe whether the side brush rotates normally.
6. If the issue persists, contact after-sales support for diagnostics, repair options, or to check for possible hardware or sensor faults.