Siemens External Control Logic / Integration Fault

Siemens charger does not start charging when scheduled by a smart home system, but works when started manually.

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Possible Causes

Incorrect API or Modbus commands from smart home controller, Time synchronization mismatch between systems, Misconfigured priority or permissions in charger, Network latency or dropouts

How to Fix / Troubleshooting

Safety first: Software integration issues do not usually affect electrical safety, but ensure manual operation remains safe.

  • Test manual mode: Confirm that the charger operates correctly when started locally without external control.
  • Review integration settings: Check IP addresses, ports, and authentication credentials between the Siemens charger and smart home controller.
  • Check schedules: Ensure that schedules in the smart home system do not conflict with schedules configured directly in the charger.
  • Use logs: Examine logs on both the charger and controller to see if commands are being sent and acknowledged.

If manual operation is reliable but automated control fails, the issue is likely in the external controller configuration rather than the charger hardware.

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Repair Difficulty

Easy 2/5

Required Part

Communication Interface / Configuration
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