E020
Greenworks
Internal Communication Bus Error
Robot mower shows E020 and stops; may mention communication or module error.
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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
Loose internal wiring harness, Faulty sensor module on CAN/I2C bus, Electrical noise from failing motor, Main PCB communication controller fault
How to Fix / Troubleshooting
Safety first: Turn OFF the mower and remove the battery if possible.
- Inspect for obvious damage: Look for crushed or pinched wiring harnesses under the cover or around the chassis.
- Power cycle: Leave the mower off for a few minutes, then power ON and see if the error clears.
- Isolate conditions: Note whether E020 appears only when blades start, when driving, or randomly. This can help a technician identify the faulty module.
Because internal communication faults are complex, further diagnosis typically requires Greenworks diagnostic tools. Contact a service center if E020 persists.
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Repair Difficulty
Professional Required
5/5
Required Part
Internal Wiring Harness
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