E11
Stiga
Wheel Encoder / Hall Sensor Failure
Robot mower displays E11 and does not move; sometimes after winter storage.
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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
Damaged wheel encoder magnet ring, Faulty hall sensor on wheel motor, Broken encoder cable, Corrosion at encoder connector
How to Fix / Troubleshooting
Safety first: Turn OFF the mower and remove it from the station.
- Check for rodent damage: After storage, inspect cables leading to the wheel motors for bite marks or breaks.
- Inspect encoder area: Remove the wheel cover or wheel (depending on model) to access the encoder magnet ring and sensor. Clean away dirt and rust.
- Check sensor gap: Ensure the hall sensor is positioned close enough to the magnet ring as per design (usually 1–2 mm). A bent bracket can increase the gap and cause E11.
- Reseat connectors: Follow the encoder cable to the main board and reseat the connector.
- Side isolation: If the error appears only when one wheel moves, that side’s encoder assembly is suspect and may need replacement.
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Repair Difficulty
Hard
4/5
Required Part
Wheel Motor Encoder Sensor
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