A TP-Link Deco unit shows its whole status through one LED, using colour and pattern together. Solid green or solid white means the Deco is registered and working normally — which of the two colours you see depends on the model. Solid yellow means the Deco is starting up (give it one to two minutes), pulsing blue means it is ready for setup, and red means a problem: pulsing red is a satellite Deco that has lost its link to the main Deco, and solid red is a Deco fault.
Deco LED colours at a glance
| Colour | Pattern | What it means | Action |
|---|---|---|---|
| Yellow | Pulsing | The Deco is resetting | Wait — do not interrupt the power |
| Yellow | Solid | The Deco is starting up | Wait one to two minutes |
| Blue | Pulsing | The Deco is ready for setup | Open the Deco app and configure it |
| Blue | Solid | Setup is in progress | Wait for the app to finish |
| Green | Pulsing | Firmware is being upgraded | Do not power the unit off |
| Green | Solid | Registered and working normally | Nothing — this is the healthy state |
| Red | Pulsing | A satellite Deco is disconnected from the main Deco | Move it closer to the main unit or check its power |
| Red | Solid | The Deco has an issue | Check the app, then reset if directed |
What is normal on a Deco?
For most Deco models — the X series and the newer Be series — the healthy state is a solid green LED. On some models the healthy state is a solid white LED instead. That difference is model-dependent, not a fault, and it is the reason two Decos in the same house can look different while both are working perfectly.
Anything that is pulsing is a state in motion: resetting, ready to pair, actively configuring, or updating firmware. Anything solid has finished. That single distinction resolves most confused readings of a Deco LED.
Red on a Deco: pulsing versus solid
Red is not one state, it is two, and they point at different hardware:
Why your Deco’s colours may not match a list online
TP-Link states plainly that Deco LED colours and their meanings vary by model, and it publishes a per-model table for exactly that reason. Older units, outdoor units and DSL or 4G Deco models do not all use the same colour set. If the LED on your unit does not match the table above, the correct reference is the model-specific table and then your unit’s own user guide.
The same caution applies to a Deco that shows an unusual colour combination for a long period: that pattern is covered by TP-Link’s separate troubleshooting page for abnormal Deco LEDs and bad ports, which walks through the hardware checks.
Next steps
- TP-Link router lights explained — the equivalent reference for Archer and other TP-Link routers.
- TP-Link Deco X55 review and Deco M5 review — what these meshes are like in practice.
- How to log in to a TP-Link device — including which address each TP-Link family answers on.
- Mesh vs extender vs repeater — useful if one Deco keeps dropping its link.
Standards and primary sources
- TP-Link, What Do Deco LED Colors Mean? — the per-colour and per-pattern meanings used throughout this page, including the model-dependence warning.
- TP-Link, Abnormal LED lights and bad ports on the TP-Link Deco — the hardware troubleshooting path for unusual LED behaviour.
- TP-Link, How to Fix TP-Link Device Domain Name Login Issues — the Deco management hostname (tplinkdeco.net) and the other family addresses.
- TP-Link Deco Quick Installation Guide (current model documentation) — the LED status section printed for a specific Deco unit.
Afroz Ahmad, “TP-Link Deco Light Colors: What Each Color Means”, afrozahmad.com, reviewed 28 September 2026.
https://afrozahmad.com/blog/tp-link-deco-lights/
This page explains the manufacturer’s published LED behaviour for the Deco range and what each state calls for. It is not a record of physical testing of any Deco model.
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