Chromecast won't cast? 9 fixes

You hit the cast button. Nothing. Either the cast icon is missing from your app, or it shows up but cannot find the Chromecast, or it connects and immediately drops. The fix is usually about Wi-Fi, not the Chromecast itself.

1. Are both devices on the same Wi-Fi?

The number one reason Chromecast does not show up is that the phone and the Chromecast are on different networks, even if both networks come from the same router.

• Open Google Home app > tap your Chromecast > gear icon > Device information. Note the Wi-Fi name.
• On your phone: check Wi-Fi settings. Note the name.
• If they do not match exactly, switch the phone to the right network.

Common gotchas:

• Phone is on the 5 GHz band; Chromecast is on 2.4 GHz
• Phone is on the guest network; Chromecast is on the main network
• Mesh systems sometimes split bands without you knowing
• Phone on cellular data because Wi-Fi is "auto-switching"

2. Restart the Chromecast properly

1. Unplug the Chromecast's USB power cable.
2. Wait 30 seconds (do not skip this).
3. Plug it back in.
4. Wait for the home screen to fully load (2 minutes).

Restarting from the Google Home app also works: open Google Home > tap your Chromecast > gear icon > Reboot.

3. Make sure your router allows multicast / mDNS

Chromecast uses mDNS to announce itself on the network. Some routers (especially business mesh systems and TP-Link Deco in certain modes) block this by default.

• In your router app, look for: IGMP Snooping, AP Isolation, Client Isolation, or Multicast settings.
• Turn AP Isolation and Client Isolation off. Turn IGMP Snooping on if available.
• Restart router after changing.

If you do not know how to find these, the simplest test is connecting to a friend's Wi-Fi or your phone's hotspot. If Chromecast works there, your home router has a setting blocking it.

4. Bluetooth on for setup and switching

Chromecast and Google Home rely on Bluetooth to find new devices and to switch which Chromecast you cast to. Even after setup, having Bluetooth off makes switching between casts unreliable.

• iPhone: Settings > Bluetooth > turn on. Then Settings > Privacy > Bluetooth > make sure Google Home has access.
• Android: Settings > Connected devices > Bluetooth > turn on.

5. Update apps

Cast support breaks when apps fall too far behind. Update:

• The app you are trying to cast from (Netflix, YouTube, Disney+, etc.)
• Google Home app
• Google Play services (Android, automatic, but check)

6. Cast from Chrome on a computer

If casting from your phone is failing, test from Chrome to see if the issue is the Chromecast or the phone.

1. Open Google Chrome on your computer.
2. Click the three dot menu (top right) > Cast.
3. Pick your Chromecast.

If casting from Chrome works but phone does not, the phone or its app is the problem. If casting from Chrome also fails, it is the Chromecast or your network.

7. Check that the Chromecast is on the right HDMI input

Easy thing to miss. Look at the TV's input/source button. Make sure you are on the HDMI input the Chromecast is plugged into. If you do not see the colorful Chromecast home screen, the TV may simply be on the wrong source.

8. Power: the Chromecast needs a real USB power source

Chromecast comes with a USB cable. Plug it into the included wall adapter, not a USB port on the back of the TV. TV USB ports often deliver less power than required, and the Chromecast acts flaky or reboots randomly.

9. Factory reset (last resort)

If nothing else works:

1. Make sure Chromecast is plugged in and powered.
2. Press and hold the button on the back of the Chromecast.
3. Keep holding for 25 seconds. The light starts flashing, then turns solid white.
4. The Chromecast factory resets. Set it up again in the Google Home app.

This wipes the Wi-Fi credentials and account link. Useful if you changed Wi-Fi password recently or moved house.

The cast icon is missing entirely

If the cast icon does not show up at all inside an app:

1. Make sure your phone and Chromecast are on the same Wi-Fi (see step 1).
2. Close the app fully and reopen it.
3. Restart your phone.
4. Reinstall the app you are casting from.
5. Some apps do not cast in certain countries because of licensing. Try a different app first to test.

Google TV / Chromecast with Google TV is different

If you have the newer "Chromecast with Google TV" (the one with a remote), it is not just a Chromecast. It is a full streaming device. Cast still works, but it can fall offline for streaming-app reasons. Check that the apps you use are signed in, then try cast.

Why this happens so often

Mesh routers and ISP rental routers have gotten more aggressive about isolating devices "for security." That breaks devices that need to talk to each other on the local network (Chromecast, smart bulbs, printers). If you find yourself fixing the same cast problem every month, look at your router's isolation settings. Some routers automatically isolate older 2.4 GHz devices from newer 5 GHz devices.