E15
Polestar Real-Time Clock (RTC) or Time Sync Error

Charger shows E15; scheduled charging and load management features do not work correctly.

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Possible Causes

Depleted RTC backup battery on control board, Corrupted time settings, Loss of NTP/time server connectivity, Faulty RTC chip on main board

How to Fix / Troubleshooting

Safety first: Most time‑related checks can be done without opening the unit. Only open the charger if you are qualified.

  • Check time settings: Using the Polestar app or local interface, verify that the charger’s date, time, and time zone are correct. Correct any errors and save.
  • Network time sync: Ensure the charger has internet access so it can synchronize with a time server. Fix any network issues first.
  • Power cycle: Turn the breaker off for 1 minute, then back on. Recheck time and scheduled charging behavior.
  • RTC battery/module: If the time resets after every power loss, the RTC backup battery on the main control board may be depleted. A technician can replace the battery or the entire board as required.
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Repair Difficulty

Easy 2/5

Required Part

Polestar EVSE Main Control Board
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