If the roller brush does not rotate, please try the following troubleshooting steps:

• Remove the rolling brush and clean it out, especially 2 ends of the rolling brush and connectors on the vacuum. 

• Turn the RoboVac upside down, then remove the rolling brush and brush guard. Cover the drop sensors with white paper and press the Start button to check if the white square connector on the vacuum rotate or not. 
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For Bounce Series and LR30 and L35 series and L50 series and L60 series(3 drops sensors)

For G series, X8 series, and X8 Pro series (4 drop sensors)

• Check if the roller brush and brush guard have been installed properly.
• Try another roller brush if you have a spare one

If the issue persists, please contact us with photos of the 2 ends of the rolling brush and 2 connectors on the vacuum.