TP-Link identifies solid blue as a Deco unit currently being configured on common models.
What Solid blue light means
TP-Link identifies solid blue as a Deco unit currently being configured on common models.
What you may notice
- The app is applying settings
- The unit may restart
- Internet is not yet available
- The light follows a pulsing-blue setup state
Most likely causes
- 01Normal setup
- 02The unit is joining the network
- 03Configuration is being written
- 04Setup stalled
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.
Wait for setup
Keep the app open and allow several minutes.
Keep power connected
Do not unplug while settings are being applied.
Check the app
Read any specific failure message before retrying.
Restart only if directed
Use the model-specific recovery flow if solid blue never changes.
Know where to stop
Interrupting configuration can require setup again. Do not reset during firmware activity.
When to call a technician or support
Contact TP-Link if solid blue remains indefinitely and the app cannot complete or cancel setup.
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.