E11
Lefant
Wall Sensor / Front IR Sensor Fault
Robot vacuum shows E11 or announces a sensor error related to wall or obstacle detection.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Front wall-following IR sensor dirty, Sensor window scratched or covered, IR sensor board failure, Loose sensor cable to mainboard
How to Fix / Troubleshooting
Safety: Turn OFF the robot before cleaning sensors.
- Step 1 – Locate wall sensor: On many Lefant models, a small IR sensor is located on the side or front of the bumper for wall-following.
- Step 2 – Clean sensor window: Wipe the sensor window with a soft, dry microfiber cloth. Remove any stickers or protective films that may block it.
- Step 3 – Inspect for damage: Check for cracks or deep scratches. If the plastic window is severely damaged, the sensor may misread obstacles.
- Step 4 – Test navigation: Power ON the robot and run it along a wall. If it repeatedly crashes or cannot detect walls, the sensor may be faulty.
- Advanced: Remove the front bumper and access the wall sensor PCB. Ensure the connector is firmly seated on the mainboard.
- Repair: Replace the wall sensor board if cleaning and reseating cables do not resolve E11.
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Repair Difficulty
Medium
3/5
Required Part
Wall/Front IR Sensor Board
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