Yarbo Robot Lawnmowers Error Codes

E01

Robot mower will not start mowing; display shows E01 immediately after power‑on or when starting a job.

Main Battery Pack Undervoltage Lockout

E02

Robot mower shuts down shortly after leaving the charging dock; display shows E02 low battery or power fault.

Battery Capacity Degradation / High Internal Resistance

E03

Display shows E03 and mower will not leave the charging dock; sometimes accompanied by a plug or lightning icon.

Charging Dock Power Supply Fault

E04

Robot mower shows E04 and refuses to start; message may indicate boundary wire or signal error.

Boundary Wire Signal Loss

E05

Mower stops near the edge of the lawn and displays E05 boundary wire short or overload.

Boundary Wire Short Circuit / Overload

E06

Robot mower displays E06 and stops; often occurs when climbing or on uneven ground.

Tilt Sensor / Roll‑Over Protection Triggered

E07

Mower shows E07 and stops; message may indicate lift sensor or that the unit has been picked up.

Lift Sensor Activation / Lift Switch Fault

E08

Robot mower displays E08 and will not start; often described as emergency stop or stop button active.

Emergency Stop Switch Engaged or Faulty

E09

Mower shows E09 and stops; message may indicate collision sensor or bumper fault.

Front Bumper / Collision Sensor Stuck

E10

Robot mower displays E10 and stops; message may indicate wheel motor overload or blocked wheel.

Drive Wheel Motor Overcurrent / Stall

E11

Mower shows E11 and stops; message may indicate wheel motor sensor error or speed sensor fault.

Drive Motor Hall Sensor / Encoder Failure

E12

Robot mower displays E12 and blades will not spin; may indicate cutting motor overload.

Cutting Blade Motor Overload / Stall

E13

Mower shows E13 and stops; message may indicate cutting motor sensor error or RPM fault.

Cutting Motor Tachometer / Speed Sensor Failure

E14

Robot mower displays E14 and refuses to start; message may indicate rain sensor or wet condition.

Rain Sensor Activation / Fault

E15

Mower shows E15 and stops; message may indicate ultrasonic sensor or obstacle sensor error.

Ultrasonic Obstacle Sensor Failure

E16

Robot mower displays E16 and stops; message may indicate GPS or positioning error (on GPS‑equipped Yarbo models).

GNSS / RTK Positioning Signal Loss

E17

Mower shows E17 and will not connect to the app; may indicate communication or Wi‑Fi/Bluetooth error.

Wireless Communication Module Fault

E18

Robot mower displays E18 and stops; message may indicate internal temperature too high.

Overtemperature Protection Triggered

E19

Mower shows E19 and stops; message may indicate low internal temperature or battery temperature sensor error.

Battery Temperature Sensor Fault / Low Temperature Lockout

E20

Robot mower displays E20 and will not start; message may indicate main board error or internal fault.

Main Control Board Self‑Test Failure

E21

Mower shows E21 and stops; message may indicate front wheel or caster error.

Front Caster Wheel Blocked or Sensor Fault

E22

Robot mower displays E22 and stops; message may indicate docking alignment or contact error.

Docking Alignment / Charging Contact Fault

E23

Mower shows E23 and stops; message may indicate security or PIN code error.

Security Lock / PIN Authentication Failure

E24

Robot mower displays E24 and stops; message may indicate time/date or RTC error.

Real‑Time Clock (RTC) / Scheduling Fault

E25

Mower shows E25 and stops; message may indicate internal communication bus error.

CAN / Serial Bus Communication Failure Between Modules

Symptom

Robot mower blades do not spin, but the mower still drives around the lawn.

Cutting System Disengaged or Mechanically Disconnected

Symptom

Robot mower display or control panel is unresponsive or some buttons do not work.

Keypad / HMI Panel Failure

Symptom

Robot mower does not return to the charging dock and stops with an empty battery somewhere in the yard.

Dock Homing / Return‑to‑Base Failure

Symptom

Robot mower emits a burning smell or shows signs of overheating around the motor area.

Electrical Overheating in Motor or Wiring

Symptom

Robot mower frequently gets stuck or spins its wheels without moving forward.

Traction Loss / Ground Clearance Issue

Symptom

Robot mower frequently reports that it is outside the working area even though it is within the lawn boundary.

Boundary Detection Sensitivity / Interference

Symptom

Robot mower is excessively noisy during operation compared to when it was new.

Mechanical Noise from Cutting System or Drive Train

Symptom

Robot mower leaves clumps of grass on the lawn instead of finely mulching.

Poor Mulching Performance

Symptom

Robot mower leaves the lawn surface scalped in some areas and too long in others.

Incorrect Cutting Height Adjustment

Symptom

Robot mower leaves uncut strips of grass and misses areas within the boundary.

Coverage Pattern / Navigation Inefficiency

Symptom

Robot mower occasionally bumps hard into obstacles instead of gently touching and turning away.

Reduced Obstacle Detection Sensitivity

Symptom

Robot mower occasionally loses connection to the Yarbo app while mowing.

Intermittent Wireless Connectivity

Symptom

Robot mower occasionally shuts down in the middle of the lawn with no error code on the display.

Intermittent Power Loss

Symptom

Robot mower vibrates excessively or bounces while mowing, leaving an uneven cut.

Imbalanced Cutting Disc or Damaged Wheels

Symptom

Robot mower’s app shows incorrect battery percentage or jumps suddenly from high to low.

Battery State‑of‑Charge (SoC) Calibration Issue

Symptom

Robot mower’s LED lights or status indicators do not illuminate, but the mower otherwise operates.

Indicator LED Circuit Failure