The reasons that the robot vacuum makes a louder sound are as follows:
1. The roller brush is entangled with foreign objects and makes abnormal noises. The roller brush needs to be cleaned in time, otherwise, it will cause damage to the roller brush;
2. To ensure the cleaning effect, the main unit adopts a fan with greater suction power, which has a stronger dust collection effect and a relatively louder sound. You can use the standard mode to work when the device is cleaning;
3. When the main unit is working on smooth tile floors and wooden floors, there will be a slight sound when the bottom scraper rubs against the floor;
4. When the main unit passes through the joints between the tiles and the floor, it will contact and clean the joints, which can produce a slight "click" sound;
5. Check whether the mopping board is installed in place. It is normal to make some noise when changing to the mopping mode.