Start with the basics: power, Wi-Fi, and the app

Most Chromecast problems come down to three things: the device isn't powered on, it's not connected to your Wi-Fi network, or the app on your phone isn't talking to it. Before you troubleshoot anything else, check these first.

Make sure the Chromecast is plugged into power and the HDMI port on your TV. Look for a small LED light on the device itself — if it's off or not lit, the device isn't getting power. Try a different USB cable or power adapter if you have one, because the original cable can fail without obvious signs. If you're using the power adapter that came with your Chromecast, use that one specifically — phone chargers sometimes don't deliver enough power.

Next, check that your Chromecast is on the same Wi-Fi network as your phone or computer. Open the Google Home app on your phone, tap the device, and look at the Wi-Fi network name listed under "Device info." If it says "Not connected" or shows a different network than the one your phone is using, that's your problem. You'll need to reconnect it to the correct network through the Google Home app.

Key Takeaways

  • Check that the Chromecast has power and is plugged into both a power source and your TV's HDMI port, because a loose cable is the most common cause of failure.
  • Your Chromecast and your phone must be on the same Wi-Fi network for casting to work, which you can verify in the Google Home app under Device info.
  • Restart the Chromecast by unplugging it for 30 seconds, then plug it back in and wait two minutes for it to fully boot up.
  • If your TV input is set to the wrong HDMI port, you won't see the Chromecast home screen even though the device is working — check your TV remote's input button.
  • Factory reset the Chromecast only as a last step, because it erases all settings and requires you to set it up again from scratch.

Restart the Chromecast and your router

A restart fixes most connection problems. Unplug the Chromecast from power for 30 seconds, then plug it back in. Wait two full minutes for the device to boot up — the LED will blink during startup and then settle into a steady color once it's ready. Don't try to cast during this time.

While the Chromecast is restarting, also restart your Wi-Fi router. Unplug it for 30 seconds, plug it back in, and wait for all the lights to stabilize. This clears temporary connection glitches that prevent your phone and Chromecast from finding each other on the network. After both devices have restarted, try casting again.

Check your TV's HDMI input and settings

The Chromecast might be working perfectly, but your TV is looking at the wrong HDMI port. Use your TV remote to press the Input or HDMI button and cycle through the available ports until you see the Chromecast home screen — it usually shows a colorful background with a Google logo or a clock. If you don't see it on any port, the Chromecast isn't outputting a signal, which means it's either not powered on or not connected to Wi-Fi.

Some TVs also have HDMI-CEC settings that can interfere with Chromecast. If your TV has a setting called HDMI-CEC, Anynet+, or Bravia Sync, try turning it off temporarily to see if that fixes the problem. The exact name and location depend on your TV brand — check your TV's manual or settings menu under "External Inputs" or "HDMI."

Reconnect to Wi-Fi through the Google Home app

If the Chromecast is powered on but not connecting to your Wi-Fi, you'll need to reconnect it. Open the Google Home app on your phone, tap the plus icon to add a device, and select "Set up device." Choose "Set up a new device" and follow the prompts to put the Chromecast into pairing mode. The app will search for nearby devices and find your Chromecast.

When the app finds it, select your Wi-Fi network and enter your password. Make sure you're entering the correct password — Wi-Fi passwords are case-sensitive, so capital letters matter. If you're using a 5 GHz Wi-Fi network, try switching to 2.4 GHz instead, because some older Chromecast models don't support 5 GHz. Once the Chromecast connects, the Google Home app will confirm the connection and you can start casting.

Update the Chromecast firmware

Chromecast devices update automatically when they're connected to Wi-Fi and plugged in, usually overnight. However, if your device hasn't been connected for a while, it might be running outdated firmware that causes casting to fail. Leave the Chromecast plugged in and connected to Wi-Fi for several hours to allow any pending updates to install.

You can check the firmware version in the Google Home app by tapping the device, then tapping the settings gear icon, then "Device info." If an update is available, it will show a notification. You don't need to do anything — the update will install automatically. Restart the Chromecast after an update completes to make sure the new firmware is fully loaded.

Clear the casting app cache and restart your phone

Sometimes the app on your phone that's trying to cast — whether it's YouTube, Netflix, or another service — gets stuck and can't communicate with the Chromecast. Restart your phone first, because that clears temporary memory and fixes most app glitches. After your phone reboots, try casting again.

If restarting doesn't work, clear the cache for the app you're trying to cast from. On Android, go to Settings, then Apps, find the app, tap Storage, and select "Clear Cache." On iPhone, you'll need to delete and reinstall the app instead, because iOS doesn't have a cache-clearing option. After clearing the cache or reinstalling, try casting again.

Factory reset as a last step

If nothing else works, you can factory reset the Chromecast to erase all settings and start fresh. Press and hold the reset button on the back of the device for about 15 seconds until the LED starts flashing orange. Release the button and wait for the device to restart — this takes about a minute. The Chromecast will return to its original factory state.

After the reset, you'll need to set it up again from scratch using the Google Home app. Go through the setup process as if it's a brand-new device: select your Wi-Fi network, enter your password, and name the device. Once setup is complete, try casting to see if the problem is resolved. If the Chromecast still doesn't work after a factory reset, the device itself may be faulty and you should contact Google support or consider replacing it.

Frequently Asked Questions

Why does my Chromecast keep disconnecting from Wi-Fi?

Chromecast can drop the connection if your Wi-Fi signal is weak, if your router is overloaded with too many devices, or if the device is too far from the router. Move the Chromecast closer to your router, or move the router closer to your TV. If you have a dual-band router, try connecting the Chromecast to the 2.4 GHz band instead of 5 GHz — 2.4 GHz has better range through walls.

Can I cast if my phone and Chromecast are on different Wi-Fi networks?

No. Your phone and Chromecast must be on the same Wi-Fi network to communicate. If you're on a guest network and the Chromecast is on the main network, they won't see each other. Connect both devices to the same network, then try casting again.

Why does the Chromecast app say "device not found"?

The app can't find the Chromecast because they're not on the same Wi-Fi network, the Chromecast isn't powered on, or there's a firewall blocking communication. Check that both devices are on the same network, make sure the Chromecast LED is lit, and restart both devices. If your router has a guest network, make sure you're not on it.

What should I do if the Chromecast is hot to the touch?

Chromecast devices get warm during normal use, but if it's too hot to hold, unplug it when ready and let it cool for 30 minutes. Make sure the device has airflow around it and isn't blocked by a TV or cabinet. If it overheats again after cooling, the device may have a hardware problem and should be replaced.

Does my Chromecast need to be on the same network as my smart home devices?

Yes, if you want to control the Chromecast with voice commands through Google Home or another smart assistant. All devices must be on the same Wi-Fi network. If the Chromecast is on a different network, you can still cast to it manually from your phone, but voice control won't work.