E17
Webasto
PEN Conductor Monitoring Fault (for certain markets)
Charger shows E17 or ‘PEN fault’ in TN‑C‑S systems; unit disables charging.
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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
Loss of neutral/earth combined conductor in supply, Incorrect TN‑C‑S configuration, Faulty PEN monitoring circuit, Loose neutral connection at terminal block
How to Fix / Troubleshooting
Safety first: PEN faults can create dangerous touch voltages. Do not bypass this protection.
- Stop using charger: Turn off the breaker and do not attempt further charging until the supply is checked.
- Electrician inspection: Have a qualified electrician verify the integrity of the neutral and earth conductors from the main service to the Webasto charger.
- Check terminations: With power off, all neutral and earth terminations should be retorqued and inspected for discoloration or overheating.
- Verify system type: Confirm that the installation matches the Webasto-approved earthing system (TN‑S, TN‑C‑S, TT, etc.).
- If supply is sound: The internal PEN monitoring circuit may be defective and require control board replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Webasto Main Control PCB (PEN Monitoring Circuit)
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