Charger shows E15; internal self-test fails at startup and charging is disabled.

Safety first: Do not bypass self-test errors; they protect against unsafe operation. Isolate power before service.

• 1. Power cycle: Turn off the charger at the breaker for 2–3 minutes, then restore power and observe if E15 reappears.
• 2. Check event log: Access the service interface and review diagnostic logs to identify which subsystem failed (e.g., RCD test, contactor test).
• 3. Firmware reflash: Using Vestel’s official service tool, reload the latest firmware to the main control board, ensuring the process completes without interruption.
• 4. Factory reset: Perform a factory reset of configuration if recommended, then reconfigure the charger.
• 5. Hardware inspection: If logs indicate a specific hardware failure (e.g., RCD test), inspect and test that component as per its dedicated procedure.
• 6. Replace main board: If firmware and external components are OK but self-test still fails, replace the main control board.