Reconnect Your Chromecast When You Change WiFi

When you switch to a new WiFi network — whether you've moved, changed providers, or upgraded your router — your Chromecast loses its connection and needs to be set up again. The process takes about five minutes and uses the Google Home app on your phone. You'll need your new WiFi network name and password, and your phone must be on the same network you're connecting the Chromecast to.

The Chromecast itself doesn't have buttons or a screen, so all reconnection happens through the app. If you've forgotten your WiFi password, you'll need to retrieve it from your router or your internet provider before you start.

Key Takeaways

  • Open the Google Home app on your phone and make sure your phone is connected to your new WiFi network before you begin.
  • Tap the plus icon to add a device, select "Set up device," and choose "Set up a new device" to start the Chromecast reconnection.
  • When prompted, select your Chromecast from the list of nearby devices and enter your new WiFi password exactly as it appears.
  • The Chromecast will restart and reconnect within two to three minutes; you'll see a confirmation message in the app when it's done.
  • If reconnection fails, restart your Chromecast by unplugging it for 30 seconds, then try the setup process again.

Open the Google Home App and Check Your Phone Connection

Start by opening the Google Home app on your smartphone or tablet. If you don't have it installed, read it from the Google Play Store (Android) or the App Store (iPhone). Sign in with the same Google account you used to set up the Chromecast originally.

Before you proceed, make sure your phone is connected to your new WiFi network. Go to your phone's WiFi settings and select the network name you want your Chromecast to join. Your phone and Chromecast must be on the same network for the setup to work. Once your phone shows a WiFi connection, return to the Google Home app.

Start the Setup Process in Google Home

In the Google Home app, tap the plus icon (usually in the top left corner) to add a new device. A menu will appear with options including "Set up device." Tap that option.

The app will ask whether you want to set up a new device or set up a device that's already been used. Choose "Set up a new device" — even though the Chromecast isn't new, this option lets you reconnect it to a different network. The app will begin searching for nearby devices.

Select Your Chromecast and Enter Your WiFi Password

After a few seconds, the app will display a list of devices it found nearby. Look for your Chromecast by name — it will show something like "Living Room" or "Bedroom" if you named it, or a generic name like "Chromecast" if you haven't. Tap on it to select it.

The app will ask you to confirm that you see a four-digit code on your TV screen. Look at the TV connected to your Chromecast — a code should appear there. If you see the same code in the app, tap "Yes" to confirm. This step verifies that you're connecting the right device.

Next, the app will ask for your WiFi network password. Type it exactly as it appears — passwords are case-sensitive, so uppercase and lowercase letters matter. If you're unsure of your password, check your router's label or contact your internet provider. Tap "Next" once you've entered it.

Wait for the Chromecast to Restart and Reconnect

After you enter the password, the Chromecast will restart. This takes about two to three minutes. You'll see a message in the app saying "Setting up your device" or similar text. Don't close the app or disconnect your phone from WiFi during this time.

Once the Chromecast has restarted and connected to the new network, the app will show a confirmation message. You may also see the Chromecast's home screen appear on your TV. At this point, the reconnection is complete, and you can start casting to it again.

Troubleshoot If the Connection Fails

If the app shows an error message or the Chromecast doesn't reconnect after five minutes, the most common fix is to restart the device. Unplug the Chromecast from power for 30 seconds, then plug it back in. Wait for it to fully boot up (you'll see the Google logo on your TV), then return to the Google Home app and repeat the setup process from the beginning.

If you're still having trouble, double-check that your WiFi password is correct by testing it on another device. Also verify that your router is broadcasting the network name (SSID) — some routers have a setting to hide the network name, which can prevent the Chromecast from finding it. If your network name is hidden, you may need to unhide it temporarily to complete the setup, then hide it again afterward.

If the Chromecast still won't connect after a restart and password verification, try moving it closer to your router temporarily. Weak signal strength can cause connection failures. Once it's connected, you can move it back to its original location.

Reconnect Your Other Devices to Cast Again

After your Chromecast is back online, any phone, tablet, or computer on the same WiFi network can cast to it again. You don't need to set up each device individually — as long as they're on the same network as the Chromecast, the cast button will appear in compatible apps like YouTube, Netflix, Spotify, and Google Photos.

If a device still can't find the Chromecast after reconnection, restart that device's WiFi connection by turning WiFi off and back on in its settings. This refreshes the device's list of available networks and usually solves the problem.

Frequently Asked Questions

Do I need to set up the Chromecast from scratch, or can I just change the WiFi?

You can't change just the WiFi without going through the setup process again. The Chromecast stores the old network information and needs to be reconnected to the new one through the Google Home app. The process is faster than the original setup because you're not creating a new account — you're just pointing it to a different network.

What if I don't remember my new WiFi password?

Check the label on the back or bottom of your router — the password is often printed there. If you've changed it since installation, log into your router's settings through a web browser on your computer (usually 192.168.1.1 or 192.168.0.1) or contact your internet provider. They can reset the password or tell you what it is.

Can I reconnect the Chromecast to the same network with a different password?

Yes. If you've changed your WiFi password but kept the same network name, go through the setup process in Google Home and enter the new password when prompted. The Chromecast will disconnect from the old password and reconnect with the new one.

Why does my phone need to be on the same WiFi as the Chromecast?

During setup, the Google Home app communicates directly with the Chromecast over your local network to send it the WiFi password and configuration. Once setup is complete, your phone doesn't need to be on the same network to cast — it just needs internet access. But during the initial connection, both devices must be on the same network.

How long does it take to reconnect a Chromecast to a new network?

The entire process usually takes three to five minutes from opening the Google Home app to seeing the confirmation message. The Chromecast restart itself takes about two to three minutes. If it takes longer than ten minutes, something has gone wrong and you should restart the Chromecast and try again.