Safety first: Network troubleshooting does not involve high voltage, but do not open the charger while powered.

Check signal strength: Use a smartphone near the charger to see Wi‑Fi signal quality. If weak, move the router or add a Wi‑Fi extender.
Re-enter credentials: In the BYD app, forget the network and reconfigure Wi‑Fi with the correct SSID and password.
Use 2.4 GHz band: Ensure the charger is connecting to a 2.4 GHz network if it does not support 5 GHz.
Reduce interference: Keep the router away from thick concrete walls and large metal objects between it and the charger.
Persistent issues: The internal Wi‑Fi module or antenna may be defective and require replacement.

BYD charger cannot connect to Wi‑Fi or loses connection frequently; app shows the charger as offline.

Possible Causes