Google Chromecast with Google TV is offline: what to do

Chromecast was working but now shows as 'offline' in Google Home or the TV shows no connection.

We could not fully consult the manufacturer's support page for this model; the steps are general and may differ in details.

Most likely causes

usually this

Router or modem restarted or no internet

Check if other devices in the house still have internet.
If needed, reboot your router and modem and wait until they are fully back online.
Signal: other devices work again and the Chromecast returns online in Google Home.

usually this

Chromecast has no power

Check the power cable and adapter and unplug the power for 10 seconds.
Plug the power back in and wait for the Chromecast to start up.
Signal: startup screen appears on the TV and Google Home shows the Chromecast as online.

common

Wifi password or router settings changed

Check whether the wifi password or network name was recently changed.
If it changed, open Google Home and enter the new wifi details or put the Chromecast back into setup mode.
Signal: Chromecast connects again and shows as online.

sometimes

Temporary software glitch on the Chromecast

Restart the Chromecast by unplugging and plugging the power cable again.
If the issue persists, restart the TV and the Google Home app and check for updates.
Signal: Chromecast comes back online and functions normally.

Factory reset

Warning: a factory reset will erase all settings, linked accounts and wifi info; you must set up the device again in Google Home.

Make sure the Chromecast is powered and the TV is on.
Press and hold the small button on the Chromecast for at least 10 seconds until the LED and TV indicate a reset.
Release the button and wait for the Chromecast to restart and show the welcome screen.
Open Google Home on your phone and set up the Chromecast again as a new device.

Frequently asked

My phone can't find the Chromecast during setup. What should I do?

Make sure your phone is on the same wifi you plan to use, and that Bluetooth and location services are enabled; restart the Google Home app and try again.

Should I use 2.4 GHz or 5 GHz wifi?

If your router uses separate names, try 2.4 GHz first; it can be more reliable during initial setup for some devices.

Will my purchased apps be lost after a reset?

Apps and purchases tied to your Google account remain, but the Chromecast loses all its settings and must be reconfigured.

Chromecast shows offline but TV has picture — why?

Reboot the router and Chromecast, then check in Google Home whether the device still uses the same wifi network.