LG Robot Vacuums Error Codes

E01

Robot vacuum will not power on at all, no lights or sounds when pressing the power button or placing on the charging dock.

Main Power Supply / Battery Protection Fault

E02

Robot vacuum does not charge on the dock; dock LED is on but robot battery icon does not increase and runtime is very short.

Charging Circuit / Dock Communication Fault

E03

Robot vacuum stops shortly after starting and displays an error related to the main brush or shows E03 on the display/app.

Main Brush Motor Overload / Stall

E04

Robot vacuum reports a side brush error or E04; side brush does not spin or spins intermittently.

Side Brush Motor Stall / Overcurrent

E05

Robot vacuum displays a wheel error or E05; one drive wheel does not turn, or the robot spins in circles and stops.

Drive Wheel Motor Stall / Encoder Fault

E06

Robot vacuum reports a cliff sensor error or E06 and refuses to move, even on flat floors away from stairs.

Cliff / Drop Sensor Obstruction or Failure

E07

Robot vacuum shows a bumper or obstacle sensor error (E07); it beeps and stops immediately after starting, even with no obstacles.

Front Bumper Switch Stuck / Obstacle Sensor Fault

E08

Robot vacuum reports a dustbin error or E08; it will not start cleaning and indicates the bin is missing or not installed correctly.

Dustbin Presence Switch / Sensor Fault

E09

Robot vacuum displays a fan or suction error (E09); suction is weak or stops completely during cleaning.

Main Suction Fan Motor Fault

E10

Robot vacuum reports a sensor calibration error or E10; navigation is erratic and the unit may spin or stop frequently.

Gyroscope / IMU Calibration Fault

E11

Robot vacuum cannot find the charging dock and shows a docking error (E11) after multiple attempts.

Dock IR / RF Localization Fault

E12

Robot vacuum reports a battery temperature or overheat error (E12) and shuts down during or after charging.

Battery Overtemperature / Thermistor Fault

E13

Robot vacuum shows a time-of-flight (ToF) or front distance sensor error (E13); it may collide with objects or stop unexpectedly.

Front Distance Sensor / ToF Module Fault

E14

Robot vacuum reports a mapping or camera error (E14); it cannot create or load maps and navigation is poor.

Upper Camera / Vision Sensor Fault

E15

Robot vacuum displays a Wi‑Fi or connectivity error (E15); it cannot connect to the LG ThinQ app or loses connection frequently.

Wi‑Fi Module / Antenna Fault

E16

Robot vacuum shows a firmware or internal error (E16) and may reboot repeatedly or freeze.

Firmware Corruption / Main PCB Logic Fault

E17

Robot vacuum reports a left wheel encoder error (E17); it may veer to one side or stop with an error.

Left Drive Wheel Encoder Signal Loss

E18

Robot vacuum reports a right wheel encoder error (E18); it may veer to one side or stop with an error.

Right Drive Wheel Encoder Signal Loss

E19

Robot vacuum displays a brush height or floor detection error (E19); it may drag the brush or lift it incorrectly.

Brush Height Sensor / Floor Type Detection Fault

E20

Robot vacuum reports an internal communication error (E20); multiple subsystems fail simultaneously.

Internal Bus / Module Communication Fault

Symptom

Robot vacuum does not respond to app commands, but cleans normally when started manually.

Cloud / App Communication Issue

Symptom

Robot vacuum does not return to the dock at the end of cleaning and stops with low battery somewhere in the home.

Dock Homing / Localization Issue

Symptom

Robot vacuum does not start cleaning at scheduled times, but manual start works.

Scheduling / Clock Configuration Issue

Symptom

Robot vacuum drags or tangles on long curtains, cables, or tassels, often requiring manual rescue.

Entanglement with Floor Objects

Symptom

Robot vacuum emits a burning smell or very hot air from the exhaust during operation.

Overheating Motor or Electrical Component

Symptom

Robot vacuum frequently bumps into furniture harder than usual and does not slow down before impact.

Obstacle Detection Degradation

Symptom

Robot vacuum frequently gets stuck on thresholds, rugs, or small obstacles without reporting a specific error code.

Mobility / Obstacle Clearance Limitation

Symptom

Robot vacuum is very loud during operation, with grinding or rattling noises from the underside.

Mechanical Wear in Brush or Wheel Drive

Symptom

Robot vacuum leaves fine dust trails or streaks on hard floors after cleaning.

Ineffective Debris Pickup / Brush-Floor Interface Issue

Symptom

Robot vacuum leaves visible debris on the floor and has noticeably reduced suction, even with no error code.

Reduced Airflow / Clogged Filtration

Symptom

Robot vacuum occasionally fails to detect low furniture and gets wedged underneath.

Height / Clearance Misjudgment

Symptom

Robot vacuum occasionally fails to detect stairs and approaches edges too closely, causing concern for falls.

Reduced Cliff Sensor Sensitivity

Symptom

Robot vacuum randomly stops in the middle of a room and powers off without returning to the dock.

Intermittent Power Loss / Loose Internal Connection

Symptom

Robot vacuum repeatedly cleans the same small area and does not progress through the rest of the room.

Navigation Logic / Sensor Misinterpretation

Symptom

Robot vacuum runs for a very short time (5–10 minutes) and then returns to the dock or shuts off without an error code.

Battery Capacity Degradation

Symptom

Robot vacuum smells musty or dusty when running, even after emptying the bin.

Odor from Dustbin and Filter System

Symptom

Robot vacuum starts but immediately returns to the dock without cleaning, with no specific error code.

Battery State Miscalculation / Low Charge Protection

Symptom

Robot vacuum vibrates excessively and rattles when moving, especially on hard floors.

Imbalanced Brush or Loose Components