E18
Neff
CAN Bus / Data Communication Fault
E18 displayed, internal communication error between modules
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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 harness between main control and display module, Damaged communication cable, Faulty main control board, Faulty display/UI board
How to Fix / Troubleshooting
Safety: Disconnect power before accessing electronic modules.
Steps:
- Inspect harness: Locate the multi‑wire communication harness between the main PCB and the user interface. Ensure all connectors are fully seated.
- Check for damage: Look for pinched, cut, or abraded wires along the harness route.
- Power reset: After reseating connectors, restore power and see if E18 clears.
- Module isolation: If possible, follow Neff service instructions to test modules individually.
Resolution: Replace the damaged harness or the faulty module (often the main control board) if E18 persists.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Module / UI Harness
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