Fixing Unstable Network with Multiple Generation Deco Units

Are you experiencing an unstable network when using multiple generations of Deco units? This issue can interfere with critical features like HomeShield login, internet connectivity, and more. In this guide, we'll walk you through the common causes of network instability and offer effective solutions to restore your Deco mesh system’s performance.

Technology Apr 17, 2025 17 Add to Reading List

Are you experiencing an unstable network when using multiple generations of Deco units? This issue can interfere with critical features like HomeShield login, internet connectivity, and more. In this guide, we'll walk you through the common causes of network instability and offer effective solutions to restore your Deco mesh system’s performance.

Common Causes of Network Instability:

Loose Ethernet Cable Connections: An improperly inserted Ethernet cable can disrupt communication between Deco units.
Outdated Firmware: Older Deco firmware can lead to performance issues and compatibility problems between different generations.
Signal Interference: Interruption from nearby electronic devices can affect wireless signals.
Deco Blinking Red: A red blinking light typically indicates the main Deco unit is not receiving internet from the modem.

Effective Solutions:

1. Replace Damaged Ethernet Cables

If your Deco units are connected via Ethernet backhaul, inspect the cables for wear or damage. A faulty cable can lead to signal loss and instability. Replace any damaged cables immediately to restore a strong connection.

2. Update Deco Firmware

Ensuring your Deco mesh system is running the latest firmware can significantly improve stability:

Open the Deco app and log in using your TP-Link ID.
Select the main Deco connected to your modem.
Tap the three-dot menu and choose “Update”.
Tap “Check for Updates”, and if a new version is available, select “Update Now”.

Firmware updates often resolve bugs and improve compatibility between multiple generations of Deco units.

3. Optimize Device Placement

For best performance, place your Deco units in open, central locations and away from electronic devices that could cause interference. Avoid placing units near microwaves, cordless phones, or thick walls.

4. Verify Deco to Modem Connection

If your Deco is blinking red, it's likely not receiving internet from the modem. Double-check that the Ethernet cable is securely connected and undamaged. Try using a different port on the modem if the issue persists.

5. Reboot the Deco Network

Rebooting your network can clear temporary bugs:

Unplug each Deco unit from power.
Wait 10 seconds, then reconnect them.
Allow the units to reboot and reconnect automatically.

When rebooted correctly, you may see your Deco flashing blue, which indicates it's in setup mode and ready for pairing.

6. Reset the Main Deco Unit

If none of the above methods resolve the issue, consider resetting the main Deco unit:

Via the Deco App:

Open the Deco app and log in.
Select the main Deco unit.
Tap the menu (three dots) and select “Reset”.
Confirm by tapping “Yes”. The unit will reboot and reset to factory settings.
Reconfigure the Deco using the app.

Using the Physical Button:

Locate the RESET button on the Deco device.
Press and hold it for about 10 seconds.
Once the Deco starts flashing blue, it's ready to be reconfigured.

Conclusion:

We hope these steps help you troubleshoot and fix issues with an unstable network when using multiple generation Deco units. Whether your Deco is blinking red or you notice Deco flashing blue during setup, the above tips should get your system back on track. Still need help? Don’t hesitate to reach out to our support team.

FAQs

1. How Do I Replace the Ethernet Cable for My Deco Connection?

For Deco-to-Modem: Disconnect the old Ethernet cable. Plug one end of the new cable into the modem's LAN port and the other into any port on the Deco. Power on the devices.
For Deco-to-Deco (Ethernet Backhaul): Connect one end of the Ethernet cable to any port on each Deco unit. Power on and configure using the Deco app.