Honda
Honda Robot Lawnmowers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E1
Robot mower will not start mowing; display shows E1 and an alert tone sounds.
Main Power Supply / Battery Connection Fault
E10
Robot mower shows E10 and stops with the front bumper pressed in or after hitting an obstacle.
Front Bumper / Collision Sensor Fault
E11
Robot mower displays E11 and stops on a slope or uneven terrain.
Incline / Roll Angle Exceeded or Sensor Fault
E12
Robot mower shows E12 and will not respond to commands from the control panel.
Keypad / User Interface Communication Error
E13
Robot mower displays E13 and stops randomly during operation without obvious obstacles.
Internal Communication Error (Main PCB to Sensor Bus)
E14
Robot mower shows E14 and the blades do not start, even though the mower can drive.
Blade Motor Circuit Open / No Feedback
E15
Robot mower displays E15 and stops near the charging station without docking correctly.
Docking Alignment / Home Position Sensor Fault
E16
Robot mower shows E16 and stops with the message related to wheel sensor or speed error.
Wheel Encoder / Speed Sensor Fault
E17
Robot mower displays E17 and refuses to start due to PIN or security error.
Security / PIN Code Lockout
E18
Robot mower shows E18 and stops with an overtemperature warning.
Overtemperature Protection Activated
E19
Robot mower displays E19 and cannot detect the guide wire or return path.
Guide Wire Signal Fault
E2
Robot mower stops shortly after starting and displays E2.
Charging Station Communication / Docking Contact Fault
E20
Robot mower shows E20 and stops immediately after startup with a system error message.
General System Error / Firmware Fault
E3
Robot mower displays E3 and will not leave the charging station.
Battery Charging Fault / Overvoltage or Undervoltage Detected
E4
Robot mower stops and shows E4 when trying to start the blades.
Blade Motor Overload / Stall Detected
E5
Robot mower displays E5 and stops moving, even though the blades may still spin briefly.
Drive Motor Overcurrent / Wheel Jam
E6
Robot mower shows E6 and refuses to start mowing after being lifted or tilted.
Tilt / Lift Sensor Fault
E7
Robot mower displays E7 and stops near the boundary wire, refusing to continue.
Boundary Wire Signal Lost
E8
Robot mower shows E8 and stops with the front lifted or on uneven ground.
Lift Sensor Activated / Fault
E9
Robot mower displays E9 and will not start; often occurs after rain or washing.
Rain Sensor / Moisture Detection Fault
Symptom
Robot mower consumes battery very quickly and run time is much shorter than specified.
Reduced Battery Capacity / High Current Draw
Symptom
Robot mower cuts unevenly, leaving scalped patches and tall areas.
Uneven Cutting Height / Deck Level Issue
Symptom
Robot mower display is blank or very dim, but the mower still seems to operate.
Display / LCD Backlight Failure
Symptom
Robot mower docks correctly but does not charge; battery remains low.
No Charging While Docked
Symptom
Robot mower does not return to the charging station and stops in the lawn with low battery.
Home Navigation Failure
Symptom
Robot mower does not start at all; no display, no lights, completely dead.
No Power / Dead Unit
Symptom
Robot mower emits a burning smell or shows signs of overheating around the motor area.
Electrical Overload / Motor Overheating
Symptom
Robot mower frequently gets stuck or spins its wheels without moving, especially on damp grass.
Loss of Traction / Wheel Slippage
Symptom
Robot mower frequently stops with the message to clean underside, but no specific error code.
Underside Contamination / Safety Sensor Trigger
Symptom
Robot mower is very noisy while cutting, with rattling or grinding sounds from underneath.
Excessive Cutting Noise / Blade or Bearing Wear
Symptom
Robot mower keypad buttons are unresponsive or require very hard presses.
Keypad Wear / Contamination
Symptom
Robot mower leaves the lawn area and crosses the boundary wire into paths or flowerbeds.
Boundary Detection Weak / Mis‑installation
Symptom
Robot mower makes loud clicking or grinding noises from one wheel while driving.
Wheel Gearbox Wear / Drive Train Damage
Symptom
Robot mower occasionally loses time or schedule settings after being powered off.
Real‑Time Clock / Memory Retention Issue
Symptom
Robot mower occasionally reboots or restarts by itself during operation.
Intermittent Power / Control Reset
Symptom
Robot mower runs but leaves uncut strips of grass between passes.
Poor Cutting Coverage / Path Overlap Issue
Symptom
Robot mower starts but shuts down after a few minutes of mowing without any error code.
Intermittent Power Loss / Thermal Cutout
Symptom
Robot mower stops frequently with the message that the mower is lifted, even when it is on flat ground.
False Lift Detection
Symptom
Robot mower stops with a message about obstacle or collision more often than expected.
Over‑sensitive Bumper / Obstacle Detection
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Robot mower will not start mowing; display shows E1 and an alert tone sounds.
|
Main Power Supply / Battery Connection Fault | View Details |
| E10 |
Robot mower shows E10 and stops with the front bumper pressed in or after hitting an obstacle.
|
Front Bumper / Collision Sensor Fault | View Details |
| E11 |
Robot mower displays E11 and stops on a slope or uneven terrain.
|
Incline / Roll Angle Exceeded or Sensor Fault | View Details |
| E12 |
Robot mower shows E12 and will not respond to commands from the control panel.
|
Keypad / User Interface Communication Error | View Details |
| E13 |
Robot mower displays E13 and stops randomly during operation without obvious obstacles.
|
Internal Communication Error (Main PCB to Sensor Bus) | View Details |
| E14 |
Robot mower shows E14 and the blades do not start, even though the mower can drive.
|
Blade Motor Circuit Open / No Feedback | View Details |
| E15 |
Robot mower displays E15 and stops near the charging station without docking correctly.
|
Docking Alignment / Home Position Sensor Fault | View Details |
| E16 |
Robot mower shows E16 and stops with the message related to wheel sensor or speed error.
|
Wheel Encoder / Speed Sensor Fault | View Details |
| E17 |
Robot mower displays E17 and refuses to start due to PIN or security error.
|
Security / PIN Code Lockout | View Details |
| E18 |
Robot mower shows E18 and stops with an overtemperature warning.
|
Overtemperature Protection Activated | View Details |
| E19 |
Robot mower displays E19 and cannot detect the guide wire or return path.
|
Guide Wire Signal Fault | View Details |
| E2 |
Robot mower stops shortly after starting and displays E2.
|
Charging Station Communication / Docking Contact Fault | View Details |
| E20 |
Robot mower shows E20 and stops immediately after startup with a system error message.
|
General System Error / Firmware Fault | View Details |
| E3 |
Robot mower displays E3 and will not leave the charging station.
|
Battery Charging Fault / Overvoltage or Undervoltage Detected | View Details |
| E4 |
Robot mower stops and shows E4 when trying to start the blades.
|
Blade Motor Overload / Stall Detected | View Details |
| E5 |
Robot mower displays E5 and stops moving, even though the blades may still spin briefly.
|
Drive Motor Overcurrent / Wheel Jam | View Details |
| E6 |
Robot mower shows E6 and refuses to start mowing after being lifted or tilted.
|
Tilt / Lift Sensor Fault | View Details |
| E7 |
Robot mower displays E7 and stops near the boundary wire, refusing to continue.
|
Boundary Wire Signal Lost | View Details |
| E8 |
Robot mower shows E8 and stops with the front lifted or on uneven ground.
|
Lift Sensor Activated / Fault | View Details |
| E9 |
Robot mower displays E9 and will not start; often occurs after rain or washing.
|
Rain Sensor / Moisture Detection Fault | View Details |
| – |
Robot mower consumes battery very quickly and run time is much shorter than specified.
|
Reduced Battery Capacity / High Current Draw | View Details |
| – |
Robot mower cuts unevenly, leaving scalped patches and tall areas.
|
Uneven Cutting Height / Deck Level Issue | View Details |
| – |
Robot mower display is blank or very dim, but the mower still seems to operate.
|
Display / LCD Backlight Failure | View Details |
| – |
Robot mower docks correctly but does not charge; battery remains low.
|
No Charging While Docked | View Details |
| – |
Robot mower does not return to the charging station and stops in the lawn with low battery.
|
Home Navigation Failure | View Details |
| – |
Robot mower does not start at all; no display, no lights, completely dead.
|
No Power / Dead Unit | View Details |
| – |
Robot mower emits a burning smell or shows signs of overheating around the motor area.
|
Electrical Overload / Motor Overheating | View Details |
| – |
Robot mower frequently gets stuck or spins its wheels without moving, especially on damp grass.
|
Loss of Traction / Wheel Slippage | View Details |
| – |
Robot mower frequently stops with the message to clean underside, but no specific error code.
|
Underside Contamination / Safety Sensor Trigger | View Details |
| – |
Robot mower is very noisy while cutting, with rattling or grinding sounds from underneath.
|
Excessive Cutting Noise / Blade or Bearing Wear | View Details |
| – |
Robot mower keypad buttons are unresponsive or require very hard presses.
|
Keypad Wear / Contamination | View Details |
| – |
Robot mower leaves the lawn area and crosses the boundary wire into paths or flowerbeds.
|
Boundary Detection Weak / Mis‑installation | View Details |
| – |
Robot mower makes loud clicking or grinding noises from one wheel while driving.
|
Wheel Gearbox Wear / Drive Train Damage | View Details |
| – |
Robot mower occasionally loses time or schedule settings after being powered off.
|
Real‑Time Clock / Memory Retention Issue | View Details |
| – |
Robot mower occasionally reboots or restarts by itself during operation.
|
Intermittent Power / Control Reset | View Details |
| – |
Robot mower runs but leaves uncut strips of grass between passes.
|
Poor Cutting Coverage / Path Overlap Issue | View Details |
| – |
Robot mower starts but shuts down after a few minutes of mowing without any error code.
|
Intermittent Power Loss / Thermal Cutout | View Details |
| – |
Robot mower stops frequently with the message that the mower is lifted, even when it is on flat ground.
|
False Lift Detection | View Details |
| – |
Robot mower stops with a message about obstacle or collision more often than expected.
|
Over‑sensitive Bumper / Obstacle Detection | View Details |
No matching codes found
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