E13
Garo
Dynamic Load Management / External CT Communication Fault
E13 displayed; charger indicates load balancing or current sharing error.
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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
Disconnected or reversed external current transformer (CT) wiring, Faulty Garo load balancing controller, Broken RS‑485 or CAN communication cable between units, Incorrect load management configuration
How to Fix / Troubleshooting
Safety first: Isolate power before working on CTs or communication wiring.
- Check CT orientation: Ensure external CTs used for house load monitoring are installed in the correct direction and on the correct phase conductors, as per Garo's diagram.
- Inspect CT wiring: Verify that CT leads are connected to the correct terminals on the Garo charger or load controller and that there are no breaks or loose screws.
- Verify communication bus: For multi‑charger setups, check the RS‑485/CAN daisy‑chain wiring between chargers. Ensure A/B (or H/L) lines are not swapped and termination resistors are set correctly.
- Review configuration: In the installer menu, confirm that dynamic load management is enabled and that the charger role (master/slave) and maximum current limits are correctly set.
- Controller replacement: If wiring and configuration are correct but E13 persists, the external load controller or the charger's communication interface may be faulty and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
External Load Controller / CT Assembly
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