Charger shows E30; display may indicate ‘Unknown Error’; no clear pattern; may occur intermittently.

Safety first: Turn off power before opening the charger.

• Record conditions: Note ambient temperature, charging current, and duration when E30 occurs. This helps in diagnosis.
• Inspect and reseat connectors: Inside the Polestar charger, gently reseat all plug‑in connectors between the main control board, power module, sensors, and communication modules.
• Check for overheating: Look for discoloration on boards or connectors that might indicate heat damage. Ensure ventilation is adequate.
• Firmware update: Check for firmware updates that may address undefined error handling.
• Component replacement: If E30 persists and no specific fault is found, replacement of the main control board or power module may be required after professional diagnostics.