Try this.
Clean the sensor window using a cotton swab or soft cloth.
Press the left, right, and front sides of the nozzle 3 to 5 times, then
turn the unit off and back on.
Run the Smart Diagnosis function on the robot vacuum.
If the Smart Diagnosis provides one of the following voice message,
follow the instructions in the message.
Voice Alert
- “Please wipe the cliff detection sensors.”
- “Please wipe the obstacle detection sensor window.”
1. Place a soft cloth on the floor and turn the robot vacuum upside down
2. Clean the robot vacuum's sensors using a cotton swab or soft cloth
before
Voice Alert: “A problem has been detected with the bumper sensor.”
(Perform this step if you hear the following voice alert)
3. Press the left, right, and front sides of the nozzle 3 to 5 times, then turn the unit off and back on.
Caution
Do not clean the product with volatile or organic solvents (e.g., thinner, solvent, acetone). This may cause product damage.
This guide was created for all models, so the images or content may be different from your product.

