E9
Makita
Wheel Encoder / Speed Sensor Error
Robot mower displays E9 and stops, often when reversing or turning
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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
Dirty or damaged wheel encoder disc, Faulty wheel speed sensor, Loose encoder wiring, Water ingress in drive motor housing
How to Fix / Troubleshooting
Safety: Turn OFF the mower and remove it from the lawn.
- Inspect wheel hubs: Check around the inner side of each drive wheel for encoder discs or magnets. Clean away mud and grass.
- Check for physical damage: Look for cracked or missing encoder discs or magnets on the Makita drive wheel assembly.
- Wiring inspection: If you can access the drive motor area, inspect the encoder/speed sensor wiring harness for damage or loose connectors.
- Dry out moisture: If the mower has been used in very wet conditions, allow it to dry indoors for 24 hours before retesting.
- Reset: Power ON, clear E9, and test in a small open area.
Persistent E9 usually indicates a failed wheel encoder or sensor on one of the drive motors, which should be replaced by a service technician.
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Repair Difficulty
Hard
4/5
Required Part
Wheel Encoder Sensor
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