COMM-FAILQL-820NWB

Brother QL-820NWB COMM-FAIL Error: Network Fix

The COMM-FAIL code on the Brother QL-820NWB indicates a communication link failure between the printer and your network (Wi-Fi, Ethernet, or Bluetooth). This is often caused by IP address conflicts, router security changes, or the printer entering deep sleep mode. To resolve this, you should restart the network handshake from the printer's menu or use the 'Printer Setting Tool' via USB to restore communication.

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Common causes

  • 1DHCP IP address conflict resulting in network unreachable status.
  • 2Wi-Fi frequency interference causing unstable connection drops.
  • 3Outdated printer firmware failing to handshake with new router security settings.
  • 4External firewall software blocking the printer's network port on the host PC.

Solutions

Diagnóstico rápido

This network error occurs when the device is unable to communicate with your host computer or mobile application. If you see the error message on the LCD or an 'Offline' status in your print queue, verify if the signal strength icon is absent or if the network cable link light is inactive.

Solución paso a paso

  1. Check all connections: Ensure your Ethernet cable is plugged in or the Wi-Fi router is broadcasting at 2.4GHz.
  2. Reboot the equipment: Power cycle both your router and the printer to refresh the DHCP lease.
  3. Factory reset network: Navigate to 'Menu' -> 'Settings' -> 'Network' -> 'Reset' on the printer display.
  4. USB Reconfiguration: Use the Brother 'Printer Setting Tool' on a PC connected via USB to manually set your SSID and password.
  5. Verify IP Connectivity: Perform a 'ping' test from your computer to the printer's current IP address.

Prevención y mantenimiento

Assign a static IP address to your printer to prevent communication loss caused by DHCP changes. Keep your firmware updated to ensure compatibility with modern network security standards. Ensure the printer remains within optimal range of your router to prevent intermittent dropouts.

Cuándo llamar a un técnico

If the printer consistently fails to hold a network connection even after a factory reset and using different cables/routers, the internal NIC (Network Interface Card) may be failing. Please contact Brother support for a potential hardware repair or replacement.

Ficha técnica del equipo

  • Technology: Thermal label printer with network integration
  • Protocols: TCP/IP (IPv4/IPv6), Wireless LAN (802.11b/g/n)
  • Connectivity: USB 2.0, Ethernet, Bluetooth 2.1
  • Media Support: Brother DK Roll series
  • Network Functions: AirPrint, Mopria, iPrint&Label support
  • Usage: Small office and POS environments
  • Official Drivers / Firmware

Steps to follow

  1. 1

    Cable/Signal Check

    Confirm physical LAN link or strong Wi-Fi signal on the printer status display.

  2. 2

    Network Reset

    Execute the 'Reset Network' function from the printer’s onboard menu.

  3. 3

    Tool Configuration

    Use the Printer Setting Tool via USB to push updated Wi-Fi credentials to the device.

Frequently asked questions

It means the printer cannot communicate with your network. This is usually due to a lost wireless connection or IP configuration issue.

It is urgent if you need to print labels for shipping or POS, but it is not a hardware-damaging error.

No, consumables do not affect networking, but you should always use genuine Brother DK rolls to avoid mechanical errors that complicate troubleshooting.

Assign a static IP address to the printer via your router settings to maintain a stable connection.

Brother QL-820NWB COMM-FAIL Error: Network Fix | Vimazdev