E14
NAC
Security PIN / Keypad Fault
Robot lawnmower shows E14 PIN Error; mower locked and will not start mowing.
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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
Incorrect PIN entered multiple times, Faulty keypad on NAC control panel, Damaged display/keypad ribbon cable, Corrupted security data on main board
How to Fix / Troubleshooting
Safety first: Keep the mower powered but stationary while dealing with PIN issues. Do not attempt to bypass security circuits.
- Verify PIN: Double‑check the PIN code from your NAC documentation or purchase records. Ensure you are using the correct sequence.
- Allow lockout to clear: If too many incorrect attempts were made, wait the specified lockout period (often 10–30 minutes) before trying again.
- Check keypad: Press each button and confirm it responds on the display. If some keys do not register, the keypad membrane or control panel may be faulty.
- Inspect ribbon cable: Open the control panel housing and check the flat ribbon cable between the keypad/display and main PCB. Reseat both ends carefully.
- Contact NAC support: If the correct PIN is not accepted and hardware appears fine, the main board may need to be reset or replaced by an authorized NAC service center.
Warning: Unauthorized attempts to bypass the PIN system may void warranty and violate local regulations.
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Repair Difficulty
Medium
3/5
Required Part
Keypad / Control Panel Assembly
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