Charger shows E20 and refuses to start; may be labeled as a "lock" or "authorization" error.

Safety first: This is a control-level issue; high-voltage circuits remain off while the error is active.

• 1. Check user manual: Refer to the Primecom manual for instructions on clearing lockout or resetting user access codes.
• 2. Factory reset: If available, perform a factory reset of the charger settings (this may erase schedules and preferences).
• 3. Inspect keypad or buttons: Ensure no button is physically stuck or jammed. Clean the surface gently with a dry cloth.
• 4. Test without RFID (if applicable): If using RFID cards, try disabling RFID authentication or using a different card.
• 5. Replace keypad or control board: If the interface hardware is faulty, replace the keypad/touch panel module or the main control board as required.