E12
Heidelberg
Real‑Time Clock / Backup Power Failure
Charger shows E12, scheduled charging or time‑based functions do not operate correctly, internal clock resets after power loss.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Depleted RTC backup battery on main board, Faulty RTC chip, Firmware bug affecting timekeeping, Excessive power interruptions
How to Fix / Troubleshooting
Safety first: Isolate mains before opening the charger.
- 1. Check time settings:
- Access the charger’s configuration interface and verify date and time.
- Correct any wrong settings and test scheduled charging again.
- 2. Observe after power cycle:
- Turn off the breaker for a few minutes, then restore power.
- Check if the time and date are retained.
- 3. Inspect RTC backup battery:
- Open the housing and locate the RTC backup battery (often a coin cell) on the main control board.
- If accessible and allowed by Heidelberg, replace it with the same type and polarity.
- 4. Firmware update:
- Check for firmware updates from Heidelberg that address RTC issues.
- Update following official procedures only.
- 5. If E12 persists:
- The RTC circuit on the main board may be defective, requiring main board replacement.
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Repair Difficulty
Medium
3/5
Required Part
Main Control Board
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