Start with the basics: Wi-Fi and power

Most casting failures come down to three things: your Chromecast is not on the same Wi-Fi network as your phone or computer, the device has lost power, or the connection between them has dropped. Before you troubleshoot anything else, check that your Chromecast is plugged in and that the LED light on the device is on. If the light is off or red, plug it into a different outlet or try a different USB cable.

Next, open your phone or computer's Wi-Fi settings and confirm you are connected to the same network your Chromecast is using. Your Chromecast will only work if both devices see the same network name. If you have a 2.4 GHz and 5 GHz network with the same name, your phone might be on one and your Chromecast on the other — they need to match.

Restart your Chromecast by unplugging it for 30 seconds, then plugging it back in. Wait for the light to turn solid white or blue before you try casting again. This fixes most temporary connection problems.

Key Takeaways

  • Your Chromecast and casting device must be on the same Wi-Fi network, and that network must have a working internet connection.
  • Restarting your Chromecast by unplugging it for 30 seconds solves most casting problems without any other steps.
  • If your router has separate 2.4 GHz and 5 GHz networks with the same name, your phone and Chromecast may connect to different bands and cannot see each other.
  • The Google Home app on your phone or tablet is where you check your Chromecast's network status and restart it remotely.
  • Forgetting and re-adding your Chromecast to the Google Home app fixes connection problems that survive a power restart.

Check your router and internet connection

Your Chromecast needs a working internet connection to cast. If your Wi-Fi is down or very slow, casting will fail or stall. Restart your router by unplugging it for 30 seconds, then plugging it back in. Wait two minutes for it to fully restart before trying to cast again.

If your internet is working on other devices but your Chromecast still will not connect, move your Chromecast closer to the router. Walls, metal objects, and distance weaken Wi-Fi signals. If it works better closer to the router, you may need to move the Chromecast permanently or buy a Wi-Fi extender.

Some routers have a guest network or a separate 2.4 GHz band. If your Chromecast is on the guest network or a different band than your phone, they cannot see each other. Log into your router settings and check which network your Chromecast is using, then switch your phone to match it.

Forget and re-add your Chromecast in the Google Home app

If restarting does not work, remove your Chromecast from the Google Home app and add it again. Open the Google Home app on your phone, find your Chromecast in the device list, tap the three dots next to its name, and select "Remove device." Confirm the removal.

Now set up your Chromecast again as if it were new. Open Google Home, tap the plus sign to add a device, select "Set up device," choose "New device," and follow the steps to connect it to your Wi-Fi. Make sure your phone is on the same network as your Chromecast during setup. Once it is added back, try casting again.

Update your Chromecast and casting app

Outdated software on your Chromecast or on your phone can block casting. Your Chromecast updates automatically when it is plugged in and idle, but you can force an update by opening the Google Home app, tapping your Chromecast, going to Settings, and selecting "System" then "About." If an update is available, it will show there.

On your phone or computer, make sure the app you are trying to cast from is up to date. Open your device's app store, search for the app (YouTube, Netflix, Spotify, or whatever you are using), and install any pending updates. Restart the app after updating.

Check if your casting app supports Chromecast

Not every app can cast to Chromecast. YouTube, Netflix, Spotify, and Google Play Music all support it, but some apps do not. Open the app you want to cast from and look for a cast icon — it looks like a rectangle with curved lines in the corner. If you do not see it, that app may not support casting to Chromecast.

If the cast icon appears but is grayed out, your Chromecast is not visible to the app. This usually means your phone is on a different Wi-Fi network than your Chromecast. Switch your phone to the correct network and try again.

Restart your phone or computer

Sometimes the casting device itself needs a restart. Power off your phone or computer completely, wait 10 seconds, and turn it back on. Once it is fully booted, open your casting app again and try to cast. This clears temporary software problems that block the connection.

If you are casting from a computer, also check that your computer's firewall is not blocking the connection. Some firewalls prevent local network communication. If you have a firewall running, temporarily disable it to test whether it is the problem, then adjust its settings to allow casting if that fixes it.

Factory reset your Chromecast if nothing else works

If you have tried everything above and casting still does not work, reset your Chromecast to factory settings. Unplug the device, then plug it back in while holding the reset button on the back for 10 to 15 seconds. The light will blink orange, then white. Release the button and wait for the light to turn solid white.

Once the reset is complete, set up your Chromecast again using the Google Home app. This erases all settings and starts fresh, which fixes problems caused by corrupted configuration data. You will need to reconnect it to your Wi-Fi and add it back to your Google Home account.

Frequently Asked Questions

Why does the cast icon not appear in my app?

The app either does not support casting or your phone is not on the same Wi-Fi network as your Chromecast. Check your Wi-Fi settings first. If your phone is on the correct network and the icon still does not appear, that app does not support Chromecast — try a different app to confirm your Chromecast is working.

Can I cast if my Chromecast is on a 5 GHz network and my phone is on 2.4 GHz?

No. Your Chromecast and phone must be on the same Wi-Fi band. If your router broadcasts both bands under the same network name, your devices may connect to different ones. Log into your router and either combine them into one network or give them different names so you can see which band each device is on.

What does it mean if the Chromecast light is red?

A red light means your Chromecast is having a problem — usually a Wi-Fi connection failure or a software issue. Unplug it for 30 seconds and plug it back in. If the light stays red, try moving it closer to your router or resetting it to factory settings.

Do I need to be on the same Wi-Fi network to cast?

Yes. Your phone or computer and your Chromecast must be on the same Wi-Fi network. You cannot cast over cellular data or from a different network. Both devices need to see the same network name in their Wi-Fi settings.

Will casting work if my internet is slow?

Casting itself does not require much bandwidth, but the content you are streaming does. If your internet is very slow, video may buffer or audio may cut out. Restart your router, move your Chromecast closer to it, or reduce the number of devices using your Wi-Fi at the same time.