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The TP-Link Deco is well-known to keep your WiFi strong in every corner of the house. It is one of those mesh systems that quietly do its job.When the deco flashes red light it means that something is not right.

In this guide, we are going to break down what it means, why it happens and how to fix it without going in circles.

What Red Light Actually Means?

When you observe that deco is flashing red then it is usually because of one of two things. Either your Deco is unable to connect to the internet or it can’t connect to the main unit in your mesh network.

Sometimes you will still see your Wi-Fi name on your phone or laptop, but nothing loads. Sometimes the connection just cuts off completely. This usually happens because:

• There is no internet from your ISP.

• If the Ethernet cable is damaged or loose.

• Incorrect tp link deco setup.

• Software or firmware errors.

• Overheating or hardware fault.

1. Test the Internet First

Before thinking that something is wrong with your Deco, check if the internet is actually working.

• Unplug the Deco from the modem.

• Connect a computer directly to the modem with an Ethernet cable.

• If you still can’t get online, the problem’s on your ISP’s side.

• If you can browse just fine, the Deco setup needs attention.

Tip: Sometimes, it is just a short outage. You have to wait for 5 to 10 minutes before starting the fix that can save you from unnecessary resets.

2. Restart All Deco Units

Yes, the old trick of “turn it off and on again” still works.

• Make sure to turn off all Deco units.

• You have to wait for 30 seconds atleast.

• Power them back on and start with the main unit connected to the modem.

If the red light changes to solid white or green, you are good to go. If deco is still flashing red comes back and move on.

3. Check Every Cable

You will be shocked to know that the big problems come from loose or damaged cables.

• Make sure the Ethernet cable between your modem and main Deco is clicked in tightly.

• Look for bent connectors.

• If you have other cable, use that if the problem clears.

• This step is especially important during tp link deco setup a weak connection at the start can cause ongoing issues.

4. Revisit the TP-Link Deco Setup

If you have recently moved the units, changed your modem or changed or messed around with network settings then it is worth redoing the setup.

• Make sure to open the Deco app on your phone.

• Look if all the Deco units are showing as online.

• If any unit is missing or offline then make sure to re add it with the help of app’s tp link deco setup wizard.

It is quick and it often solves sync issues between units.

5. Update the Firmware

Firmware updates are not just about new features. They just fix errors that can cause deco flashing red.

• Within the app make sure to go Settings > Update Deco.

• If any update is available make sure to install that.

• Then you have to restart the units afterward.

A lot of connectivity problems are removed after a firmware refresh.

6. Do a Factory Reset (Last Option)

If nothing else works then start fresh.

• Press and hold the reset button on the Deco for about 10 seconds.

• Wait until the LED turns yellow.

• Run the tp link deco setup by using the app.

This will erase all the custom settings so this is the last move.

7. Don’t Ignore Placement and Heat

Decos are to be placed in an open area. Therefore,

• Always keep them out in the open area and away from thick walls.

• Do not place them near heaters or inside closed cabinets.

• Overheating can cause the deco flashing red.

How to Avoid Red Light Problems in the Future

• Do the tp link deco setup firmly.

• Make sure to keep your app and firmware updated.

• Don’t forget to check the cables every few months.

• Use a surge protector to guard against power spikes.

Conclusion

The deco flashing red light can be frustrating, but it is also a warning that something is not right with your Deco from delivering internet. Most of the time, it is fixable with a restart, cable check, firmware update or quick setup redo.