E003
ABB
Internal DC Bus Overvoltage
Charger shows E003 and does not energize the vehicle; fan and display may still operate.
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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
Faulty DC link capacitor bank, Defective DC bus voltage sensing circuit, Sudden grid transients or surges, Malfunctioning power factor correction (PFC) stage on power module
How to Fix / Troubleshooting
Safety: Internal capacitors can retain dangerous voltage even after power is removed. Only qualified personnel should open the charger enclosure.
- Power cycle: Turn off the upstream breaker for at least 5 minutes to allow internal DC bus capacitors to discharge. Turn power back on and check if E003 clears.
- Check for recent surges: If the error appeared after a storm or known power surge, consider installing a surge protective device (SPD) upstream and have the charger inspected for damage.
- Inspect ventilation: Ensure the ABB charger’s cooling vents and fan inlets are not blocked. Overheating can aggravate DC bus issues.
- Internal inspection (technician only): A service technician should visually inspect the DC link capacitor bank on the power module for bulging, leakage, or burn marks, and test the DC bus sensing circuit on the main control board.
- Replace faulty module: If capacitors or the PFC/power module are defective, replace the complete power module assembly as per ABB service documentation.
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Repair Difficulty
Professional Required
5/5
Required Part
Power Module / DC Link Capacitor Bank
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