E15
Porsche Real-Time Clock / Time Synchronization Fault

Porsche EV home charger shows E15; internal clock or scheduling functions do not work correctly and charging may not start at programmed times.

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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

Failed real-time clock (RTC) chip on main control PCB, Depleted RTC backup battery (if present), Loss of NTP time synchronization due to network issues, Corrupted time settings in firmware

How to Fix / Troubleshooting

Safety first: Timekeeping faults are not hazardous, but still disconnect power before opening the unit.

  • Manual time reset: Log into the Porsche wallbox interface and manually set the correct date and time. Save and reboot the unit.
  • Disable schedules temporarily: To restore basic charging, disable scheduled charging and allow immediate charging until the time issue is resolved.
  • Check network time: If using NTP, verify that the wallbox has network access and that the configured NTP server is reachable.
  • Firmware update: Apply any available firmware updates that may address RTC or scheduling bugs.
  • Technician RTC check: If the time drifts rapidly or resets after power loss, a technician may need to replace the main control PCB or the RTC backup battery (if it is a separate, serviceable component).
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Repair Difficulty

Medium 3/5

Required Part

Real-time clock circuit on main control PCB
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