The ERROR 100 error on your Sonos Soundbar means the speaker has lost connection with your home Wi-Fi network or the Sonos app can’t communicate with it. Restarting your router and the soundbar usually resolves this within a few minutes.

Error code ERROR 100
Meaning Sonos Soundbar cannot connect to the network or is unreachable by the Sonos app
Severity Medium — playback stops until connection is restored
Time to fix 5–15 minutes
Tools needed None (smartphone with Sonos app helpful)

What the ERROR 100 error means

Error 100 is Sonos’s way of telling you the soundbar has dropped off your network or the app can no longer find it. This is a connectivity issue rather than a hardware fault, and it’s one of the most common problems reported by Sonos owners. It usually clears up once the network connection between your router, phone, and soundbar is re-established.

Common causes

  • Wi-Fi router has been restarted, reset, or changed its network name/password
  • Soundbar has lost its connection to the network temporarily
  • Weak Wi-Fi signal due to distance from the router or interference
  • Router firmware update or firmware mismatch causing device drop-off
  • Sonos app not updated to the latest version
  • IP address conflict on the home network

How to fix the ERROR 100 error

  1. Restart the soundbar: Unplug it from the power outlet, wait 30 seconds, then plug it back in and wait for it to fully boot.
  2. Restart your router: Power cycle your router and modem, then give it a minute to fully reconnect before checking the soundbar again.
  3. Check the Sonos app for updates: Open your app store and make sure you’re running the latest version of the Sonos app, then reopen it.
  4. Move closer to the router: If your soundbar is far from the router, try temporarily moving it closer to rule out a weak signal.
  5. Re-add the soundbar to your Sonos system: In the app, go to Settings > System > Add Product and follow the setup steps to reconnect it.
  6. Factory reset as a last resort: If nothing works, reset the soundbar to factory settings and set it up again from scratch using the Sonos app.

If you’re troubleshooting other Sonos issues at the same time, it’s worth comparing notes with guides like Sonos Soundbar ERROR Error Code: Causes and Fixes and Sonos Soundbar ERROR Error Code: Causes and Fixes, since many connectivity fixes overlap across Sonos error codes. If your soundbar is connected to a TV and you’re also getting audio dropouts on the TV side, the steps in Hisense Smart NO Error Code: Causes and Fixes may help rule out a TV-side sound fault.

FAQ

Why does my Sonos Soundbar keep showing Error 100 after I fix it once?
A. This usually points to a weak or unstable Wi-Fi signal. Try moving the soundbar closer to your router or using a wired Ethernet connection if your model supports it.

Do I need to reset my whole Sonos system to fix Error 100?
A. No, a full system reset is rarely needed. Restarting the soundbar and router fixes this in most cases; only reset as a last resort.

Can a router firmware update cause Error 100?
A. Yes, router updates can sometimes change network settings or temporarily drop connected devices, triggering this error until the soundbar reconnects.