Wallbox shows 'Error 20'; charger remains offline in the app and may not respond to remote commands.

Safety first: Network troubleshooting does not require opening the unit; keep mains power on unless otherwise necessary.

• Check local LEDs: Verify that the charger’s status LEDs indicate normal standby (consult the manual). If the unit is powered but offline in the app, the issue is network-related.
• Verify Wi-Fi signal: Use a smartphone at the charger location to check Wi-Fi strength. If weak, move the router closer or install a Wi-Fi extender.
• Re-enter credentials: In the Wallbox app, forget the charger’s network and reconfigure Wi-Fi settings, ensuring the correct SSID and password.
• Router settings: Ensure that the router is not blocking the charger’s MAC address and that outbound ports required by Wallbox cloud services are open.
• Ethernet test (if available): If the model supports Ethernet, temporarily connect via cable to rule out Wi-Fi hardware issues. If Ethernet works but Wi-Fi does not, the Wi-Fi module may be defective.

If the charger remains offline after network checks, the communication module or main board may require replacement by a technician.