E9
Stiga
Main Board Internal Error
Robot mower displays E9 immediately after power‑up; no movement.
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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
Corrupted firmware, Moisture damage on main PCB, Burnt component on control board, Incorrect voltage from power supply or battery
How to Fix / Troubleshooting
Safety first: Turn OFF the mower and remove it from the charging station.
- Visual inspection: Remove the top cover to access the main PCB. Look for signs of moisture, corrosion, or burnt components. If water ingress is visible, allow the mower to dry in a warm, dry place for at least 24 hours (do not use direct heat sources).
- Check connectors: Reseat all major connectors (battery, motors, sensors) one at a time to ensure good contact.
- Battery voltage check: If you have a multimeter and skills, measure battery voltage at the connector. Compare with the rated voltage on the battery label. Very low voltage can cause board errors.
- Firmware update: Some Stiga models allow firmware updates via service tools only. Contact a Stiga dealer to check if a firmware reload can clear E9.
- Service: Persistent E9 usually indicates a failed main board that must be replaced and programmed by an authorized technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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