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 needed.

• Check local LEDs: Verify that the charger’s status LEDs indicate normal standby (consult 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 need replacement by a technician.