Why does the Xiaomi Robot Vacuum X20+ make an abnormal sound while charging?

If the Xiaomi Robot Vacuum X20+ makes an abnormal sound while charging, please refer to the following information:
1. It is normal for the device to produce some sounds during charging, especially because the water pump or internal components can activate during docking and self-cleaning processes;
2. Make sure the station is placed on a flat, stable surface to avoid vibration noise;
3. Do not place the robot and station near walls or furniture that can amplify the sound;
4. Periodically clean the water pump filter and internal components to prevent blockage-related noises;
5. If water is being refilled or discharged during charging, slight operational sounds are expected;
6. Unplug and replug the station if abnormal sounds persist after cleaning, and observe if the noise repeats;
7. If the noise is unusually loud or persistent, please check for any obstructions or contact after-sales service for further inspection.