VW wallbox display or app shows E003; charger does not energize; vehicle shows ‘Check power supply’ or does not detect charging station.

Safety first: Work inside the VW wallbox or main panel only if you are a qualified electrician. High voltage can cause serious injury or death.

• Check other loads: Verify that other appliances on the same circuit or panel are working normally. Flickering lights or brownouts may indicate a supply issue.
• Verify dedicated circuit: Confirm that the VW wallbox is on its own dedicated breaker sized according to the installation manual. Shared circuits can cause undervoltage.
• Inspect breaker position: Ensure the VW wallbox breaker is fully in the ON position and not partially tripped. Reset by switching fully OFF then ON.
• Look for obvious wiring damage: Without opening the charger, inspect the conduit or cable feeding the wallbox for visible damage or pulled‑out sections.

To properly diagnose E003, an electrician should measure line‑to‑line and line‑to‑neutral voltages at the VW wallbox input terminals and verify phase rotation and neutral continuity. If supply is correct, the internal power supply board or voltage sensing circuit in the VW wallbox may be faulty and require replacement.