E016
Alfen
External Load Balancing / Smart Meter Communication Fault
Charger shows E016; dynamic load balancing with external meter fails and charging current is limited or disabled.
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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 RS485 or Modbus cable to external meter, Incorrect meter address or protocol settings, Faulty external load balancing meter, Damaged communication port on Alfen charger
How to Fix / Troubleshooting
Safety first: Isolate power before modifying RS485/Modbus wiring.
- Step 1 – Check wiring: Verify that the twisted‑pair cable between the Alfen charger and the external meter is correctly connected (A/B polarity) and shielded as per the installation guide.
- Step 2 – Confirm meter power: Ensure the external meter is powered and displaying values.
- Step 3 – Verify protocol settings: In the Alfen configuration, check that the correct meter model, baud rate, parity, and Modbus address are set.
- Step 4 – Test bus integrity: If multiple devices share the bus, temporarily disconnect others to see if communication with the charger and meter stabilizes.
- Step 5 – Bypass load balancing (temporary): If safe and allowed by design, disable dynamic load balancing in the configuration to restore basic charging while troubleshooting.
- When to call a technician: If E016 persists, a technician should test the RS485 lines and may need to replace the external meter or charger communication board.
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Repair Difficulty
Medium
3/5
Required Part
RS485 / Modbus Communication Interface
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