Charger shows E16; app indicates 'RFID reader error' or 'Authentication module fault' on RFID‑enabled models.

Safety first: This fault affects access control, not high‑voltage circuits, but still disconnect power before opening.

Steps:

• Test multiple cards/fobs: Try more than one authorized RFID tag to rule out a bad card.
• Check reader window: Clean the RFID reader area on the Walli front panel with a soft dry cloth. Do not use solvents.
• Reboot and re‑learn cards: Power cycle the charger and, if possible, re‑register RFID cards via the Walli app or admin interface.
• Internal inspection: With power off, remove the front cover and locate the RFID reader board and its cable to the main control board. Ensure the connector is fully seated and the cable is not pinched.
• Replace RFID reader: If the reader is still not detected, replace the Walli RFID reader module/front panel assembly.