E016
Siemens External Control / Load Management Communication Fault

E016 displayed; charger refuses to start when connected to a load management or smart home system.

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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 miswired Modbus/RS-485 or Ethernet cable, Incorrect IP or bus address configuration, Faulty external energy manager or smart meter, EMI on communication lines

How to Fix / Troubleshooting

Safety first: Communication wiring is usually low voltage but may be routed near mains; isolate power before modifying wiring.

  • Bypass external control: If possible, temporarily disable external load management in the Siemens configuration to see if the charger operates normally in standalone mode.
  • Check cabling: Inspect twisted-pair communication cables for damage. Verify correct polarity (A/B) and termination resistors for RS-485, or correct pinout for Ethernet.
  • Verify settings: Ensure the charger’s communication parameters (baud rate, address, IP, port) match those of the external controller or energy manager.
  • Test external device: Confirm that the external controller is powered, online, and not reporting its own errors.

If E016 only occurs when connected to a specific external system, the issue is likely in that system. If it occurs even with known-good controllers and wiring, the charger’s communication interface may be faulty.

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Repair Difficulty

Medium 3/5

Required Part

Communication Interface (RS-485/Ethernet Module)
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