Heidelberg
Energy Measurement Drift / Calibration Issue
Charger’s integrated energy readings seem inaccurate compared to an external meter, but no error code is shown.
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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
Internal meter calibration drift, Incorrect phase wiring through internal meter, Firmware bug in energy calculation, External meter using different measurement method
How to Fix / Troubleshooting
Safety first: Any work on internal metering requires isolation of mains.
- 1. Compare over time:
- Measure energy over a longer period (e.g., full charge) to reduce short‑term discrepancies.
- 2. Check wiring:
- Verify that all phases and neutral are correctly wired through the internal energy meter module as per Heidelberg diagram.
- 3. Firmware update:
- Install any firmware updates that address metering accuracy.
- 4. Replace meter if significantly off:
- If deviations remain large (>5–10%) and wiring is correct, replace the internal energy meter.
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Repair Difficulty
Hard
4/5
Required Part
Internal Energy Meter Module
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