If your E20 robot vacuum is making an unusually loud sound while operating, please try the following troubleshooting steps:

1. Adjusting the Suction Power: Change the suction settings on the robot vacuum. Observe if the noise level fluctuates with different suction levels. This method can help identify whether the noise is related to the robot vacuum motor's suction function.

2. Checking for Foreign Objects: Ensure the roller brush area and dustbin are clear of any debris or foreign objects.

3. Maintenance of Accessories: Clean the cyclone, high-performance filter, and sponge to ensure the robot vacuum operates properly.

Note: When the robot vacuum pauses its operation, the suction fan will efficiently suck the debris from the roller brush into the dustbin, ensuring no dirt remains on the floor. As a result, if you suddenly pause the robot during its operation, you will hear a short 3-second loud suction noise.

If you have any other questions regarding the E20 robot vacuum, please don't hesitate to contact us for further assistance.