TP-Link's current LED guide identifies pulsing blue as ready for setup on common Deco models.
What Pulsing blue light means
TP-Link's current LED guide identifies pulsing blue as ready for setup on common Deco models.
What you may notice
- The unit appears in the Deco app
- Internet is not yet available through it
- The light pulses blue after a reset
- Setup has not been completed
Most likely causes
- 01A new unit awaits setup
- 02The unit was reset
- 03Configuration was lost
- 04The app setup did not finish
Safe checks, in order
Start with the simplest non-invasive check. Stop as soon as the error clears; repeated resets can hide a condition without correcting it.
Open the Deco app
Sign in to the account that owns the network.
Add the unit
Follow the exact model setup flow.
Keep it near the main unit
Complete initial setup before moving it to its final location.
Do not reset again
Resetting restarts the setup state rather than fixing it.
Know where to stop
Use the supplied adapter and do not interrupt an indicated firmware update.
When to call a technician or support
Contact TP-Link if the app cannot discover a pulsing-blue unit after phone Bluetooth, Wi-Fi, and permissions are verified.
When you call, have the exact product or vehicle model, model year where relevant, the complete code or symbol, and when it appeared.
Where this information came from
We use the manufacturer's current published guidance as the starting point, then organize it into a safer, beginner-friendly sequence.
TP-Link Support — Deco LED color meanings Source last checked August 16, 2026. Manufacturer instructions and model manuals take priority over this independent summary.