TP-Link Deco DSL light keeps blinking or line does not sync

What can cause this?

These are possibilities, not a diagnosis for every model. Review your exact device manual.

• Settings, software or network conditions may vary by model
• Hardware issues are possible if safe checks do not help

Safe steps to try

1. 01

   Step 1

   Confirm that the product is a Deco DSL model operating as a DSL modem/router.

2. 02

   Step 2

   Check that the cable is in the DSL port and observe sync status for 1–2 minutes.

3. 03

   Step 3

   If the LED keeps blinking, inspect the cable and splitter externally only.

4. 04

   Step 4

   If DSL synchronises but the internet is down, confirm ISP connection type and credentials privately.

5. 05

   Step 5

   Ask the ISP or TP-Link to check the line if it never synchronises.

When should you contact support?

If the problem persists, a part appears damaged, or a device gets dangerously hot, stop unsafe use and contact the manufacturer. Keep backups where appropriate. Never disassemble electrical equipment or batteries yourself.

Original manufacturer source

We summarised the official source. Features and menu labels can vary by model and region.