Your LG CordZero R9 robot vacuum plays an error voice message when it detects that the dust bin or pre-filter is incorrectly installed.
Why Does the Voice Message Play?
- The pre-filter or dust bin is not installed correctly.
- The sensor does not recognize the pre-filter or dust bin.
How to Resolve the Issue
Step 1. Reinstall the Pre-Filter and Dust Bin
- 1. Remove the pre-filter from the dust bin, and then reinstall it securely in its correct position with no gaps.
- 2. Push the assembled dust bin fully into the robot vacuum until you hear a click.
Step 2. Restart Your Robot Vacuum
- 1. Place your robot vacuum on a flat surface.
- 2. Turn the main power switch Off, and then turn it back On to reset the sensor.
Step 3. Still Need Help?
If the issue continues after you complete the steps above, contact us through the LG Chatbot on the LG website or request service.
Frequently Asked Questions (FAQ)
- Q. Can I Reinstall the Pre-Filter Immediately After Washing It?
-
A. No. Let the
pre-filter dry completely in a well-ventilated area away from direct
sunlight before you reinstall it.
Do not use the pre-filter while it is wet. Moisture can enter the motor and damage your robot vacuum.
- Q. Do I Need to Restart the Robot Vacuum Every Time I Empty the Dust Bin?
-
A. No. You do not need
to restart your robot vacuum after routine emptying if the
pre-filter and dust bin are installed correctly.
Restart your robot vacuum only if you hear the "Check the dust bin" voice message.
This guide is based on standard models. The settings menu may vary by model.

