E17
AL-KO Rear Wheel or Caster Sensor Error

AL-KO robot mower displays E17 and stops 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

Rear caster wheel jammed, Damaged rear wheel rotation sensor, Broken sensor magnet, Loose sensor wiring

How to Fix / Troubleshooting

Safety first: Turn off the mower and place it on its side on a soft surface. Wear gloves.

  • Check rear wheel movement: Spin the rear caster or support wheel by hand. It should rotate freely. Remove any grass or string wrapped around the axle.
  • Clean sensor area: Many AL-KO models use a magnet and sensor near the rear wheel. Clean off dirt and grass that may block the sensor.
  • Inspect magnet: Ensure the magnet disc or ring on the wheel is intact and not cracked or missing segments.
  • Check wiring: Follow the cable from the rear wheel sensor to the main PCB. Reseat the connector and inspect for damage.
  • Test operation: After cleaning and reconnecting, test the mower in a small area. If E17 recurs, replace the rear wheel sensor assembly.
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Repair Difficulty

Medium 3/5

Required Part

Rear Wheel Rotation Sensor
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