The display shows E003 and charging is disabled; this is often logged as an overcurrent or short-circuit event.

Safety first: Overcurrent events can indicate serious wiring faults. Turn off the main supply and do not re-energize until basic checks are complete.

• Step 1 – Check upstream protection: Verify that the MCB/fuse feeding the Alfen charger has not tripped or blown. If it has, do not simply reset it; investigate why.
• Step 2 – Inspect cable and plug: Examine the tethered cable or socket and the user cable for cuts, crushing, burn marks, or melted insulation. Replace any damaged cable immediately.
• Step 3 – Verify configuration: Using the Alfen configuration tool or web interface (if available), confirm that the maximum current setting matches the supply rating and installation design. Do not set it higher than the breaker rating.
• Step 4 – Internal inspection: With power OFF and locked out, remove the cover. Inspect the main power contactor and output terminals for signs of overheating, welded contacts, or loose connections. Tighten terminal screws to the torque specified in the Alfen installation manual.
• Step 5 – Test without vehicle: After performing checks, power up the charger with no vehicle connected. If E003 appears immediately, the fault is likely internal (contactor or PCB). If it only appears when charging, suspect the cable or the vehicle.
• When to call a technician: If you suspect a welded contactor or an internal short, a qualified technician should test and replace the power contactor or the main control board as needed.