The main brush does not rotate while the robot do tasks.

1. Confirm that the main brush is installed correctly. Align the square adapter at the top of the main brush with the robot interface and install it. Align the main brush cover plate with the robot card slot and install it with a click.
2. Check if there are any foreign objects stuck on the main brush, and use a cleaning brush to clean the tangled hair and foreign objects on the main brush.
3. Manually rotate the main brush and check if it rotates normally.