E05
Webasto
Protective Earth (PE) Conductor Fault
Charger refuses to start; E05 or ‘PE error’ displayed; red LED; installation ground fault indicated.
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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
Missing or high-resistance earth connection, Loose PE terminal in Webasto terminal block, Corroded or broken grounding conductor, Faulty PE monitoring circuit on main PCB
How to Fix / Troubleshooting
Safety first: Do not operate an EV charger without a verified protective earth. Shock risk is severe.
- Visual check: Confirm that the green/yellow earth conductor is firmly connected at the Webasto terminal block and at the distribution panel.
- Test outlet/line: Have a qualified electrician measure earth continuity and impedance from the charger to the main earth bar.
- Check for corrosion: In outdoor installations, inspect junction boxes and earth bars for rust or loose clamps.
- Do not bypass earth: Never link neutral to earth at the charger to ‘trick’ the PE monitor. This is unsafe and violates code.
- If PE wiring is correct: The internal PE monitoring circuit on the Webasto control board may be defective and require board replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Webasto Main Control PCB (PE Monitoring Circuit)
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