E12
Mennekes
Energy Meter / Current Transformer Fault
E12 appears; charger indicates metering error or energy measurement fault (on metered models).
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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
Faulty internal energy meter, Disconnected current transformer (CT) leads, Incorrect meter configuration, Damaged metering PCB
How to Fix / Troubleshooting
Safety first: Isolate the charger before accessing the metering compartment.
- Check meter display (if separate): If the Mennekes charger uses a separate MID energy meter, verify that it powers up and shows plausible readings.
- Inspect CT wiring: Ensure that CT secondary leads are firmly connected to the metering inputs and not reversed or open-circuited.
- Configuration check: Use the service interface to confirm that meter type and CT ratios are correctly configured in the charger firmware.
- Replace faulty meter: If the meter does not power up or readings are erratic despite correct wiring, replace the internal energy meter or metering PCB.
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Repair Difficulty
Hard
4/5
Required Part
Internal Energy Meter / Current Transformers
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