The Google Home app walks you through the steps for Chromecast and Chromecast Ultra setup.
If you've already set up your Chromecast on a mobile device, you don't need to set it up again on a different mobile device if all devices are on the same Wi-Fi network.
What you need to get started
- A Chromecast device (3rd gen or older)
- A Google Account
- A display device with an HDMI input, such as a high-definition television (HDTV)
- An Android phone or tablet with Android 9.0 or later that supports a 5 GHz connection
- Access to a secure wireless network, with the password available
Important: Availability and performance of certain features, services and applications are device- and network-dependent, and might not be available in all areas. Subscription(s) may be required, and additional terms, conditions and/or charges may apply.
Set up Chromecast or Chromecast Ultra
- Plug in your Chromecast.
- Open the Google Home app
.
- Tap Devices
Add
.
- Follow the steps.
- Setup is successful. You're all done!
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Add 
.Troubleshoot setup
If setup didn't work, try the following steps:
- Reboot your Chromecast.
- Unplug your router, then plug it back in.
- Connect manually to your Chromecast's service set identifier (SSID).
- Open your phone's Settings app
tap Wi-Fi
- Open the Google Home app and try to set up your device again.
- Open your phone's Settings app
- Factory reset your Chromecast.
- Contact support.
tap Wi-Fi Note: Support for Chromecast (1st gen) has ended, which means it no longer receives software or security updates, and Google doesn't provide technical support. Users may notice a degradation in performance.