Confirm that your home WiFi network is working correctly — test it by connecting with your phone or tablet.

Keep a laptop or tablet nearby, as the setup is easier to complete on a larger screen.

If you have changed your internet provider, modem/router, WiFi name (SSID), or password, you will need to reconnect your inverter using the updated details.

On the inverter display, press the Back or Menu button to open the Setup menu.

Navigate to Setup → Wi-Fi Access Point → Activate / Enable.

The inverter will start broadcasting a WiFi network whose name begins with FRONIUS_240.XXXXXX.

The default password is usually 12345678, unless your inverter label lists a different password or your installer has provided a unique one.

Open the WiFi settings on your phone, tablet, or laptop and select the network that begins with FRONIUS_240.

Enter 12345678 (or the custom password provided for your inverter).

After connecting to the hotspot, open a web browser such as Chrome.

In the address bar, type 192.168.250.181 and press Enter.

When the Fronius web interface loads, log in using the Customer account (or Installer if required).

If you do not know your password, contact your solar installer for help.

In the interface, go to Settings → Network (or Communication → Network, depending on your model).

At the bottom of the Network Settings menu, select the home WiFi network you want the inverter to connect to.

Click Set.

Enter your WiFi password, then click Save or Apply.

When prompted, confirm that you want to apply the new settings (look for a tick or checkmark icon).

On the inverter display, navigate to Setup → Network → Status.

Check that a valid IP address is shown — if it displays 0.0.0.0, the inverter is not yet connected.

You can also confirm connection by logging in to your Fronius Solar.web portal and checking that live data is updating.

If WiFi signal is weak near the inverter, move your router closer or install a WiFi extender.

Ensure the WiFi password is entered exactly, including capitals and special characters.

If the inverter still will not connect, restart the process from Step 2 and try again.

Persistent issues may require a firmware update or assistance from your installer or Fronius Support.

Stand near your inverter and use your phone to see if your home WiFi network appears in the list.

If your WiFi network does not show up, the signal is too weak — move your router closer or install a WiFi extender.

Your inverter can only connect if it can detect your home WiFi network from its location.

If you have not changed internet providers, try restarting the inverter before updating the WiFi settings.

Turn the AC supply OFF using the main switch or inverter circuit breaker.

Turn the DC supply OFF using the isolator beside the inverter.

Wait until the inverter fully shuts down, then turn the DC back ON, followed by the AC.

Once it restarts, check for a solid blue WiFi light — this indicates a successful reconnection.

If the blue light does not appear, continue with the manual reconnect steps below.

Press and hold the middle button on the inverter until the WiFi indicator above the icon begins flashing.

This turns on the inverter’s built-in WiFi hotspot.

Open your device’s WiFi settings and look for a network starting with FRONIUS_240.XXXXXX.

Select it.

Enter the default password 12345678.

Wait until your device shows a tick or ‘connected’ status before continuing.

Open a web browser such as Chrome or Safari.

Type 192.168.250.181 into the address bar and press Enter.

The inverter’s local interface will appear, showing system bubbles and live data.

Tap the menu icon (three horizontal lines or ‘hamburger’ icon) in the top-right corner.

Select Communication.

Choose Customer as the login role.

Enter your customer password. Your installer will have provided this after installation.

After logging in, open the menu again and select Network.

Make sure your phone remains connected to the Fronius WiFi hotspot.

In the middle section of the page, tap Wi-Fi.

Your available home WiFi networks will appear.

Select your home WiFi network, enter your WiFi password, and save the settings.

Once connected, the inverter will automatically switch to your home WiFi network.

Wait a few moments and check the inverter’s WiFi indicator:

• Solid blue light = connected to WiFi
• Flashing light = still attempting to connect

You can also confirm the connection by checking your live data on Fronius Solar.web.

If no WiFi networks appear, use a WiFi extender or consider an Ethernet connection.

Double-check your WiFi password — it is case-sensitive.

If the inverter still will not connect, restart the unit and repeat the steps from Step 3.

For ongoing issues, contact your installer or Fronius Support.