TP-Link describes solid yellow as startup on common Deco models. A brief yellow light is normal; a light that never changes may indicate a problem.
What Solid yellow light means
TP-Link describes solid yellow as startup on common Deco models. A brief yellow light is normal; a light that never changes may indicate a problem.
What you may notice
- The unit was just powered on
- Wi-Fi from that unit is unavailable
- The light stays yellow beyond several minutes
- The app cannot discover the unit
Most likely causes
- 01Normal startup
- 02A power interruption
- 03A restart after an update
- 04A failing adapter
- 05A firmware or hardware fault
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 two minutes
Do not interrupt an ordinary boot cycle.
Check power
Reseat the supplied adapter at the unit and wall outlet. Try another known-working outlet.
Power-cycle once
If yellow remains well beyond startup, disconnect power briefly and restart.
Check model guidance
Use the exact model's manual before resetting; LED sequences vary across the Deco range.
Know where to stop
Do not substitute an adapter with different voltage or polarity. Stop using a hot, swollen, or damaged adapter.
When to call a technician or support
Contact TP-Link if the unit remains yellow with a verified outlet and correct adapter after a normal restart.
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.