E13
Robomow
Wheel Encoder / Speed Sensor Fault
Robomow shows E13 and stops, often when reversing or turning near obstacles.
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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 cable, Main board input failure
How to Fix / Troubleshooting
Safety first: Turn the mower OFF and place it on a stable surface before lifting.
- Access wheel encoder: On many Robomow models, the encoder is located on the inner side of the drive wheel or motor. Remove the wheel cover or wheel as per the service manual.
- Clean encoder disc: Use a soft brush or compressed air to remove dust, grass, and dirt from the encoder disc and sensor area.
- Check sensor alignment: Ensure the sensor is positioned close to, but not touching, the encoder disc. Adjust if it has been bent out of place.
- Inspect wiring: Follow the encoder cable to the main board and reseat the connector.
- Reassemble and test: Refit the wheel, power ON, clear the error, and test movement.
- If E13 persists on one side: Replace the affected wheel encoder/sensor assembly.
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Repair Difficulty
Hard
4/5
Required Part
Wheel Encoder Sensor
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