Robot mower displays E9 and refuses to start mowing from the charging base.
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.
Possible Causes
How to Fix / Troubleshooting
Safety first: Disconnect the power supply from mains before working on the charging base. Turn OFF the mower before cleaning contacts.
Steps to check:
- Clean contacts: Wipe the mower's charging contacts and the base plates with a dry cloth. Remove oxidation with a fine abrasive pad if needed.
- Check power supply: Verify the Worx AC adapter LED (if present) is lit. Test the outlet with another device.
- Inspect base LED: Confirm the base LED indicates normal operation per the manual. Abnormal blinking may indicate a base fault.
- Battery check: If the mower is older, the lithium‑ion battery pack may have degraded. Check in the app or display for battery health information if available.
- Test with another outlet: Move the base and power supply to a known good outlet and retest.
When to call a technician: If E9 persists with clean contacts and known good power, the charging base PCB or battery pack likely needs replacement.
Repair Difficulty
Required Part
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