E13
Heidelberg
External Current Transformer (CT) / Dynamic Load Management Fault
Charger displays E13, charging stops when another high‑load appliance in the house turns on, or charger never reaches full configured current.
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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
Incorrect installation of external CT clamp, CT installed on wrong conductor or direction, Broken CT cable, Faulty CT input on charger
How to Fix / Troubleshooting
Safety first: External CTs are installed on live mains conductors. Only a qualified electrician should adjust or install them. Isolate power where possible.
- 1. Verify CT installation:
- Locate the external current transformer clamp used for dynamic load management.
- Ensure it is clamped around the correct phase conductor as specified by Heidelberg.
- Check the arrow or marking on the CT for correct current flow direction.
- 2. Inspect CT cable:
- Follow the CT cable from the clamp to the charger.
- Look for cuts, pinches, or loose terminals at the CT input.
- 3. Configuration check:
- In the charger settings, confirm that dynamic load management is enabled and CT ratio is correctly configured.
- 4. Test operation:
- With CT correctly installed, start a charge and switch on other loads.
- The charger should reduce current smoothly without triggering E13.
- 5. Replace CT if faulty:
- If E13 persists and wiring is correct, replace the external CT clamp with a Heidelberg‑approved part.
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Repair Difficulty
Hard
4/5
Required Part
External Current Transformer Clamp
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