E18
NAC
Main Board to Control Panel Communication Failure
Robot lawnmower shows E18 Communication Error; display may freeze or mower does not respond to commands.
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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 display/control panel ribbon cable, Oxidized connector pins, Faulty control panel PCB, Main board communication driver failure
How to Fix / Troubleshooting
Safety first: Turn OFF the mower and remove the battery before opening the control panel or main housing.
- Inspect cables: Remove the top control panel and locate the ribbon cable or harness connecting it to the main board. Carefully disconnect and reconnect both ends.
- Clean connectors: If pins appear dull or oxidized, gently clean with contact cleaner and a lint‑free swab, then reconnect.
- Check for pin damage: Ensure no pins are bent or pushed back in the connector housing.
- Panel substitution: If available, test with a known‑good NAC control panel. If communication is restored, replace the faulty panel.
- Main board check: If a good panel still shows E18, the main PCB may have a communication circuit fault and require replacement.
Warning: Do not force ribbon cables; they are fragile and easily damaged.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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