E15
Yard Force
Wheel Encoder / Speed Sensor Error
Robot mower shows E15 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 Hall sensor on drive motor, Loose encoder magnet, Broken encoder wiring
How to Fix / Troubleshooting
Safety first: Turn OFF the mower and disconnect the battery. Support the mower securely before removing wheels.
Steps:
- 1. Remove drive wheel: Take off the affected wheel to access the encoder disc or magnet on the motor shaft.
- 2. Clean encoder: Use a soft brush and compressed air to remove dirt and grass from the encoder disc or magnet area.
- 3. Inspect sensor: Check the Hall sensor or optical sensor alignment relative to the encoder. Ensure it is firmly mounted and not bent.
- 4. Check wiring: Follow the sensor wires back to the main PCB. Look for breaks or loose connectors.
- 5. Test movement: Reassemble and, with blades disabled, run the mower while lifting the wheel slightly to see if E15 reappears.
- 6. Replace encoder/sensor: If the sensor is damaged or the encoder disc is cracked, replace the drive motor encoder kit or the entire drive motor assembly.
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Repair Difficulty
Hard
4/5
Required Part
Drive Motor Encoder / Hall Sensor Assembly
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