E17 displayed; charger reports clock or time synchronization error (for scheduled charging).

Safety first: Isolate power before opening the unit.

• Check time settings: Using the app or web interface, verify and correct the date, time, and time zone.
• Network time: Ensure the charger has internet access so it can synchronize with NTP servers if supported.
• Inspect RTC battery: On some Garo boards, a small coin‑cell battery backs up the RTC. If accessible and permitted by Garo, replace it with the same type and polarity.
• Disable schedules: As a temporary workaround, disable scheduled charging and use manual start until the RTC issue is resolved.
• Board replacement: Persistent E17 after battery replacement and time correction indicates a faulty RTC circuit; replace the main control board.