If your Deco won’t stop flashing that blue light, you are not alone. It is supposed to be “ready to set up” when it’s blinking blue, but sometimes it just keep blinking nonstop. And that is actually the time when you realize something is wrong.
In this guide we will go through the deco blinking blue problem happens and how to fix it without the need of tech guy.
What the Blue Blink Actually Means?
Before you start unplugging cables and mashing buttons, understand the signal. On a TP-Link Deco:
Blinking blue = It is in setup mode and is ready to pair.
Solid blue (for a few seconds) = Setup complete.
If anything happens other than these points, something is not right.
If the light keeps blinking, the tp link deco setup process either did not finish or failed altogether.
Common Reasons It Gets Stuck
Some of the reasons are:
Wi-Fi connection failed – Deco is unable to connect with the main router.
App setup got interrupted – You closed the TP-Link Deco app during the setup.
Weak signal from main unit – If it is a mesh node, maybe it is too far away.
Firmware mismatch – The app and the hardware are not on the same page.
You reset it but didn’t re-add it properly – Easy to do, very simple.
The best part is that all these issues can be fixes easily without the need of any technical expert.
Step-by-Step — Troubleshooting Tips
Here is exactly the solution, to fix deco blinking blue problem.
Step 1: Power Cycle
This is simple often work more than your expectations.
Make sure to unplug the Deco from power.
Wait 30 seconds.
Plug it back in.
Watch the light. If it still blinking blue, keep going.
Step 2: Check Your Internet Source
If your main internet connection is not working, your tp link deco setup will never complete.
Test internet on another device connected directly to your modem/router.
If that is down, fix that first. Deco can’t extend anything if not receiving anything.
Step 3: Use the App Properly
Let’s see:
Open the TP-Link Deco app.
If it says “add a new Deco,” do it.
Follow the on-screen steps exactly.
Stay near the unit until it is done. Move your phone away and you will sometimes lose the pairing.
Step 4: Check Distance (Mesh Units Only)
If this is a secondary Deco in a mesh system, make sure to shift it closer to the main one during setup. You can move it back once it is paired properly.
Step 5: Firmware Update
Deco also blinks blue when the firmware is outdated.
In the app, check for updates.
Apply them.
Reboot the Deco after the update.
Step 6: Hard Reset (When All Else Fails)
If nothing works then go for hard reset.
Find the reset pinhole on the bottom.
Hold a paperclip in there for about 10 seconds until the light goes yellow.
Release, then go through the tp link deco setup process again from the app.
Reconfiguration After Reset
Once you are completed the hard reset then the Deco is basically a blank slate. It does not remember your Wi-Fi name, your password or even that it was part of a mesh.
Here is how to do reconfiguration:
Open the TP-Link Deco app – Log in with your TP-Link account. If you forgot the password, reset it now.
Tap “Add a Deco” – Select the exact model you have from the list. Picking the wrong one is a common reason for the deco blinking.
Follow the on-screen steps slowly – The app will ask you to connect your phone to the Deco’s temporary Wi-Fi. Do it and wait for it to confirm before tapping next.
Set your network name and password – If this is part of your tp link deco setup, make sure it matches the rest of your mesh network if you are adding a node.
Let it finish syncing – This can take a couple of minutes. If you see the light go from blinking blue to solid white, then your re done.
Don’t start moving the Deco back to its final spot until you know for sure it is connected. Finish the setup where the signal is strong then relocate it.
Conclusion
The deco blinking blue problem can be fixed easily. Most of the time, it is just the device sitting in setup mode waiting for you to finish the tp link deco setup correctly. A restart, proper app use, a firmware update or a hard reset plus reconfiguration will bring it back to working.
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