Siemens Internal Reset / Watchdog Trigger

Charger randomly reboots during charging sessions without any visible error code.

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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

Firmware bug causing watchdog resets, Overheating of control board, Intermittent short on low-voltage rails, Power supply instability from mains

How to Fix / Troubleshooting

Safety first: Frequent reboots can interrupt charging unexpectedly; monitor vehicle SOC and avoid critical low levels until resolved.

  • Update firmware: Install the latest Siemens firmware, which may address known stability issues.
  • Check temperature and ventilation: Ensure the charger is not overheating; improve airflow if necessary.
  • Inspect for loose connectors: With power OFF, reseat all low-voltage connectors on the control board.
  • Monitor supply: Have an electrician check for voltage dips or transients on the supply that could trigger resets.

If reboots continue after firmware and environmental checks, the main control board may be defective and require replacement.

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Repair Difficulty

Hard 4/5

Required Part

Main Control Board
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