The most common reason Chromecast loses WiFi is that your router and the device are on different network bands

Chromecast connects over the 2.4 GHz band, not the 5 GHz band that many modern routers broadcast by default. If your router sends out both bands at once (called dual-band), Chromecast may connect to the wrong one or fail to see the network at all. The second most common cause is that your WiFi password changed — either you updated it, or your router reset itself — and Chromecast is still trying to use the old one.

Less often, Chromecast sits too far from the router, your router's channel is crowded with interference from neighbouring networks, or the device firmware is out of date. A few quick checks in order will tell you which one you are facing.

Key Takeaways

  • Chromecast only connects to 2.4 GHz WiFi, so if your router broadcasts only 5 GHz or has both bands mixed together, you may need to separate them or create a 2.4 GHz network name.
  • If Chromecast was connected before and suddenly stopped, the most likely cause is that your WiFi password changed or your router restarted.
  • Move Chromecast closer to the router and away from microwaves, cordless phones, and baby monitors, which all interfere with 2.4 GHz signals.
  • Restart both Chromecast and your router by unplugging them for 30 seconds, then plugging them back in — this fixes most connection problems.
  • If Chromecast still will not connect after these steps, factory reset the device and set it up again from scratch using the Google Home app.

Check whether your router broadcasts a 2.4 GHz network

Open the WiFi network list on your phone or computer and look for your router's network name. If you see two names — one with "5G" or "5GHz" in it and one without — your router is broadcasting both bands separately, and Chromecast should see the 2.4 GHz one. If you see only one network name and it says "5G" or "5GHz", your router is broadcasting only the 5 GHz band, and Chromecast cannot connect to it.

If your router broadcasts only 5 GHz, log into your router's settings (usually by typing 192.168.1.1 or 192.168.0.1 into a web browser, or using your router's app) and look for a setting called "Band" or "Frequency". Change it to broadcast both 2.4 GHz and 5 GHz, or create a separate 2.4 GHz network. The exact steps depend on your router model — check the manual or the router manufacturer's website for instructions.

Forget the network on Chromecast and reconnect with the current password

If Chromecast was connected before but stopped working, the stored password may be outdated. Open the Google Home app on your phone, select your Chromecast device, tap the settings icon (gear), scroll down, and tap "Forget network". Chromecast will disconnect and erase the saved WiFi details.

Then set up Chromecast again from the beginning: open Google Home, tap the plus icon to add a device, select "Set up device", choose "New device", and follow the prompts to enter your WiFi network name and current password. Make sure you type the password exactly as it is — capital letters, numbers, and special characters all matter.

Restart Chromecast and your router

Unplug Chromecast from power for 30 seconds, then plug it back in. While it is restarting, unplug your router for 30 seconds as well, then plug it back in. Wait for both devices to fully boot up — this usually takes two to three minutes. The lights on your router should stop blinking and settle into a steady pattern.

This step fixes most connection problems because it clears temporary errors in both devices' memory and forces them to re-establish the connection from scratch. If Chromecast connects after this, you are done. If it still will not connect, move to the next step.

Move Chromecast closer to the router and away from interference

2.4 GHz signals do not travel as far as 5 GHz, and they are easily blocked by walls, metal, and other devices. Move Chromecast to within 15 feet of your router and in the same room if possible. Also move it away from microwaves, cordless phones, baby monitors, and wireless speakers — all of these broadcast on the 2.4 GHz band and can drown out your WiFi signal.

If moving Chromecast is not practical, try moving your router instead, or consider a WiFi extender that broadcasts 2.4 GHz. Once Chromecast connects, you can move it back to its original location if the signal is strong enough to reach it there.

Check your router's WiFi channel and switch to a less crowded one

If your router is in a building with many other WiFi networks nearby, your channel may be crowded with interference. Log into your router's settings and look for a setting called "Channel" or "WiFi Channel". The 2.4 GHz band has 11 channels in the United States, but channels 1, 6, and 11 do not overlap with each other — use one of those three.

You can check which channels your neighbours are using by opening a WiFi analyzer app on your phone (search for "WiFi analyzer" in your phone's app store). Look at the graph and choose a channel that has fewer networks on it. Change your router to that channel, wait a minute for it to explore, and try connecting Chromecast again.

Factory reset Chromecast and set it up again

If none of the above steps work, factory reset Chromecast to erase all settings and start fresh. Unplug Chromecast, then plug it back in while holding down the reset button (a small indented button on the device itself) for 10 to 15 seconds. The light will blink orange, then white — release the button when you see white. Chromecast will restart and return to factory settings.

Once it finishes restarting, open Google Home, tap the plus icon, select "Set up device", choose "New device", and follow the setup steps again. This time, make sure you are on the correct 2.4 GHz network and that you enter the password correctly. If Chromecast connects during setup, the problem is solved. If it still will not connect, the issue may be with your router or internet connection rather than Chromecast itself.

Frequently Asked Questions

Can I use Chromecast on a 5 GHz network?

No. Chromecast only supports 2.4 GHz WiFi. If your router broadcasts both bands, Chromecast will see and connect to the 2.4 GHz network. If your router broadcasts only 5 GHz, you must change your router settings to also broadcast 2.4 GHz, or create a separate 2.4 GHz network.

Why does Chromecast disconnect from WiFi randomly?

Random disconnections usually mean Chromecast is too far from the router, the signal is weak, or there is interference from other devices on the 2.4 GHz band. Try moving Chromecast closer to the router, moving it away from microwaves and cordless phones, or switching your router to a less crowded WiFi channel.

What if I forgot my WiFi password?

You can reset your router to factory settings by holding the reset button for 10 to 15 seconds, but this will erase all your WiFi settings and connected devices. A better option is to log into your router using a computer or phone connected by ethernet cable, or use your router's app to view or change the password.

Does Chromecast work on a guest network?

Yes, Chromecast can connect to a guest network as long as it broadcasts 2.4 GHz. However, some guest networks block device-to-device communication, which may prevent your phone from casting to Chromecast. If casting does not work on the guest network, try connecting both your phone and Chromecast to the main network instead.

How do I know if my Chromecast is broken?

If Chromecast will not connect after you have restarted it, moved it closer to the router, and factory reset it, the device itself may be faulty. Try borrowing another Chromecast to test your router and WiFi setup. If the borrowed device connects without problems, your original Chromecast likely has a hardware issue.