Charger indicates E12; internal clock or synchronization error, scheduled charging may not work

Safety first: Isolate mains power before opening the charger to access internal boards.

Step-by-step checks:

• 1. Check time settings: Access the KEBA configuration interface and verify date, time, and time zone. Correct any obvious errors.
• 2. Network time: If using NTP, ensure the charger has network access to the configured time server. Test connectivity from the same network.
• 3. Disable scheduling: As a temporary workaround, disable scheduled charging and allow immediate charging to confirm that only the clock function is affected.
• 4. Inspect RTC battery (power off): Open the housing and locate the RTC backup battery on the main control board (often a coin cell). Check for low voltage or leakage.
• 5. Replace RTC battery: If the battery is removable and specified as a service part, replace it with the exact type recommended by KEBA, observing polarity.
• 6. Board replacement: If the RTC IC itself is faulty or not serviceable, replace the main control board.

After repair, reconfigure time and any schedules, then verify correct operation over at least 24 hours.