Deco x55 solid red light
The LED is solid red. The Deco has an issue. On the main Deco, it cannot reach the Internet.
Cause 1 of 2The main Deco cannot connect to the Internet. TP-Link lists loose or faulty Ethernet cables, an ISP outage, incorrect DNS settings and a MAC address mismatch with the modem as the common causes. Source: How to Fix the TP-Link Deco Solid Red Light, p. 1
First checkMake sure all Ethernet cables are connected securely, and replace old or visibly damaged cables.
Causes and checks
The main Deco cannot connect to the Internet. TP-Link lists loose or faulty Ethernet cables, an ISP outage, incorrect DNS settings and a MAC address mismatch with the modem as the common causes. Source: How to Fix the TP-Link Deco Solid Red Light, p. 1
- Make sure all Ethernet cables are connected securely, and replace old or visibly damaged cables.
- Connect only the main Deco directly to the ISP modem. A satellite Deco connected to the modem instead of the main Deco causes the red light.
- Connect a PC or spare router directly to the modem. If it has no Internet connection, contact your ISP before continuing.
- Change the IPv4 DNS servers to 8.8.8.8 and 8.8.4.4.
- Clone the MAC address of your old router or laptop to the main Deco.
The Deco has an issue. Source: Appearance, p. 2
All 2 causes checked. Contact TP-Link Technical Support.
Service
If the checks above do not clear it, contact TP-Link Technical Support, tp-link.com/support. Contact Technical Support page at tp-link.com/support, and the Help center of the Deco app. Source: About This Guide, More Info, p. 1
Other Deco X55 indicators
- Status LED, pulsing yellow: The Deco is resetting.
- Status LED, solid yellow: The Deco is starting up.
- Status LED, pulsing blue: The Deco is ready for setup.
- Status LED, solid blue: The Deco is setting up.
- Status LED, pulsing green: The Deco is upgrading firmware.
- Status LED, solid green: The Deco is all set up and connected.
- Status LED, pulsing red: The satellite Deco is disconnected from the main Deco.
Sources
- User Guide, AX3000 Whole Home Mesh Wi-Fi 6 System Deco X55 (EU, V3.0). TP-Link Systems Inc. Document 1910013645, revision REV3.0.0, 2024, 16 pages, en-US. static.tp-link.com (PDF). Retrieved 13 November 2026.
- What Do Deco LED Colors Mean?. TP-Link Systems Inc. Document FAQ 1464, revision Last updated 2017-01-17, 2017-01-17, 1 pages, en-US. tp-link.com. Retrieved 13 November 2026.
- TP-Link Deco Solid Red Light: What It Means and How to Fix It. TP-Link Systems Inc. Document FAQ 3672, revision Last updated 2023-06-15, 2023-06-15, 1 pages, en-US. tp-link.com. Retrieved 13 November 2026.
- Main Deco Failed to Complete Setup. TP-Link Systems Inc. Document FAQ 2239, revision Last updated 2023-07-12, 2023-07-12, 1 pages, en-US. tp-link.com. Retrieved 13 November 2026.
- How to Reset Deco: Reset or Reboot Your Deco Whole-Home Wi-Fi System. TP-Link Systems Inc. Document FAQ 1457, revision Last updated 2026-10-08, 2026-10-08, 1 pages, en-US. tp-link.com. Retrieved 13 November 2026.
- Deco Wi-Fi Settings. TP-Link Systems Inc. Document FAQ 1591, revision Last updated 2026-04-17, 2026-04-17, 1 pages, en-US. tp-link.com. Retrieved 13 November 2026.
- How to Update or Upgrade TP-Link Deco Firmware (3 Methods). TP-Link Systems Inc. Document FAQ 1599, revision Last updated 2026-08-24, 2026-08-24, 1 pages, en-US. tp-link.com. Retrieved 13 November 2026.
- Error When Adding a Deco Satellite Node: How to Fix It. TP-Link Systems Inc. Document FAQ 1447, revision Last updated 2026-05-07, 2026-05-07, 1 pages, en-US. tp-link.com. Retrieved 13 November 2026.
Page numbers are the numbers printed in the manual. Where this page and the manual differ, follow the manual.