Home / Navimow / i2 AWD Error Codes
Navimow i2 AWD Error Code 4105: ACU Hardware Error
The mower detected a hardware issue in its Autonomous Control Unit.
Reviewed October 5, 2026 by RobotMower.help. Independent guidance checked against the official manufacturer documentation.
Quick answer
Press STOP to clear the code, restart once if it persists, and contact support if it returns.
If the code returns after one controlled retry, preserve the evidence and contact Navimow support rather than repeatedly resetting the mower.
Error 4105 at a glance
| Code | 4105 |
|---|---|
| Official meaning | ACU Hardware Error |
| Likely area | an internal ACU hardware or communication fault rather than a normal map or terrain problem |
| First action | Press STOP to clear the code, restart once if it persists, and contact support if it returns. |
What error 4105 actually means
The mower detected a hardware issue in its Autonomous Control Unit. The code identifies the system reporting the fault, but it does not by itself confirm which component must be replaced.
The most useful owner checks concern an internal ACU hardware or communication fault rather than a normal map or terrain problem. Keep them external and reversible so you do not create a safety risk or remove useful diagnostic evidence.
Fix Navimow i2 AWD error 4105 step by step
- Press STOP. Make the mower safe before touching or moving it.
- Document the event. Photograph the error and note battery level, location, weather, task, and unusual sounds or movement.
- Inspect externally. Look for an internal ACU hardware or communication fault rather than a normal map or terrain problem.
- Follow the manufacturer sequence. Press STOP to clear the code, restart once if it persists, and contact support if it returns.
- Run one short supervised test. Stay nearby and stop if operation is abnormal.
- Escalate a repeat fault. Save the serial number, firmware, app version, time, and video for support.
How this page supports related diagnostics
Error 4105 belongs to the i2 AWD hardware and communication cluster. Compare it with error 4101 for internal communication, error 7102 for wheel-encoder data, and error 6110 for motion-control response.
If it occurs once
Complete the official steps and supervise one short task. A single cleared alert may be temporary.
If it returns immediately
Stop repeated resets. An immediate recurrence points away from a one-time condition and toward a fault that needs manufacturer diagnosis.
Safety and mistakes to avoid
Turn the mower fully off before checking wheels, the underside, sensors, buttons, cables, or charging contacts. Do not open the battery pack, steering assembly, motors, ACU, IMU, or sealed electronics. Do not force wheels or steering parts.
Frequently asked questions
What does Navimow i2 AWD error 4105 mean?
The mower detected a hardware issue in its Autonomous Control Unit.
How do I clear error 4105?
Press STOP to clear the code, restart once if it persists, and contact support if it returns.
Can I keep mowing after error 4105?
Only after the code clears and the mower completes a short supervised test without abnormal movement, steering, charging, positioning, or safety behavior.
When does error 4105 need service?
Contact Navimow support when the code returns after the official steps, appears immediately after restart, or the mower cannot operate safely.
Related Navimow guides
- Navimow troubleshooting hub
- Robot mower error-code library
- Navimow i2 AWD error 4101
- Navimow i2 AWD error 7102
- Common Segway Navimow problems
Primary source
Segway Navimow support documentation for error 4105. RobotMower.help is independent and is not affiliated with Segway Navimow.