After general troubleshooting, if the noise is not from the side brush motor nor the rolling brush, then it might be from the suction fan.

You can refer to the following troubleshooting to have a try:

- Empty the dust collector, clean the suction inlet and air passage:

*For non-Max models of Bounce series and LR20/LR30/L35 series, check to make sure all 3 filters (filter cover, white high-performance filter, and black sponge filter) are properly aligned in the right places.

*For Max models of Bounce series, G series, L70, and X8 series, check to make sure the filter is properly aligned in the right places.

- With the dust collector removed from the unit, hold the vacuum upright with the bumper facing up, the suction "hole" facing downwards. Shake out any debris that might be stuck in the suction area. Make sure there is air passing through that area after starting the vacuum.

- Make sure the vacuum has not run over any liquids. If there are any parts that have gotten wet, make sure they are completely dry before re-installing. If water went into the suction fans, the internal parts would be damaged.

For the Bounce series and G series, you could refer to the videos here to check if there is any debris stuck in the suction fan.

If you need further assistance, please scroll down to email us with a video depicting the noise so we can identify where the noise comes from and assist you further.