Audi EV home charger shows E02 and refuses to start charging; vehicle may indicate ‘Check power supply’ or ‘Charging not possible’.

Safety first: Only a qualified electrician should remove the wallbox cover or measure live voltages. Turn off the dedicated breaker before any inspection.

• Verify supply breaker and rating: Confirm that the wallbox is connected to the correct voltage (e.g., 230 V single-phase or 400 V three-phase) as specified on the Audi charger nameplate. Ensure the breaker and cable size match Audi’s installation manual.
• Check for loose terminals: With power off and cover removed by a professional, inspect the L1/L2/L3/N/PE terminals on the internal supply terminal block. Tighten any loose screws to the torque specified by Audi. Look for discoloration or heat damage.
• Measure line voltage: With power restored, an electrician should measure voltage at the wallbox terminals under load. If voltage is outside the allowed range (often ±10%), correct the supply wiring, breaker size, or cable length.
• Inspect internal power supply module: If supply voltage is correct but E02 persists, the low-voltage power supply section on the main control board may be defective. Look for bulged capacitors or burnt components; replace the main control board or power supply module per Audi parts catalog.

Do not attempt to bypass voltage protections. Persistent E02 requires professional diagnosis of the supply and internal electronics.