Guide to the single status light on the C4000 modem 

This page is for CenturyLink modems that look like this:

For the following models:
Greenwave C4000XG  *  C4000LG

Not the right kind of modem? Try the tower modem guide instead.

The Greenwave C4000 modem/WiFi router comes in two models, each with different specifications. The one you use will depend on the type of internet service you have (XG for fiber,  LG for DSL).

Regardless of the specific model, the status LED ring on the front of the modem will function in the same way. This single status light replaces the multiple lights (Ethernet, Internet, WAN, etc.) found on earlier modems. If you have a C4000LG model, you will also see a DSL status light on the back of the modem.

Boot-up sequence

The status light ring may change colors repeatedly as it goes through the initial installation process.

While the C4000 initially boots up, it will blink blue while it is looking for the CenturyLink network. It should turn solid BLUE once it has connected. 

Troubleshooting tip: If the light blinks blue for more than 5 minutes, check to make sure the green DSL cord is firmly plugged in to both the modem and the wall jack. If it blinks blue again for more than 5 minutes, service is not connected to that jack. Please try another jack or chat with us for further help.

After completing the syncing and setup process, the LED color will change to indicate the connection status:

The light turns solid GREEN

Once the light is green, you're connected to the internet and you can get online! 

The light turns solid AMBER

If the light is amber/orange, this means the setup process is not yet complete. Use the My CenturyLink mobile app or browse to, and follow the prompts to finish setup.

The light turns solid RED

This means a connection failure has occurred. Try disconnecting the power, waiting a few minutes, and repeating setup. If you still get a red light, you will need to chat with an agent to get further troubleshooting help. 

DSL light

The C4000LG also has a DSL status light, found beneath the ports on the back side, as seen in the photo. This light will flash red and green while the modem is syncing with the network.

  • Once the status light ring on the front turns blue, the DSL light should turn green to indicate it's connected and ready to finish setting up.

The DSL light turns GREEN

Your modem is connected to our network and the line is active.

The DSL light turns RED

This means the network is not being detected by your modem. This may happen for one of these reasons:
  • The CenturyLink network hasn't yet been activated at your address. Check your service start date, wait till 5 p.m. on that date, then try again.
  • The particular jack you are using isn't hooked up or is faulty. Try plugging the DSL cord into a different jack. If the DSL light remains red after verifying your date and checking your cords and jacks, you will need to chat with a service agent to get help.

If the DSL light is OFF

This indicates nothing is connected to the modem port. Check to make sure the green cord is firmly plugged in to the wall jack and into the DSL port on the modem.

Other light functions

The status light ring on the front will also display different behaviors at certain times, depending on the state of the modem. You will see it change when you are pairing a device to your WiFi network through WPS, as well as when the modem is updating its firmware.

WPS pairing/syncing
Firmware updates

Troubleshooting the status lights

If the main LED or DSL status light on your C4000 exhibits different behavior, or indicates a problem based on the guides above, then there may be an issue with the network or with your equipment. Here are some things to try:

  1. Try rebooting your modem. 
  2. Make sure your equipment is set up correctly. If you have the C4000LG model and subscribe to home phone service, you need to place DSL filters on all landline phone cords in your home. You should not put a filter on the modem cord. If you have the C4000XG, you do not need line filters. 
  3. In some cases, the jack may be faulty or may not be connected to the CenturyLink network. If you have more than one phone jack in the house, connect the modem to a different one and try the setup process again.  

If the problem continues, contact technical support for help.

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Introducing WiFi 6

Intel WiFi 6 Gig+ is the next generation in-home WiFi technology, designed for the ever-increasing demand of connected homes and gigabit connections. Compared to WiFi 5, it delivers:

  • Up to 3x the connectivity speed 
  • Up to 4x the data capacity 
  • Up to 75% less lag time (latency) for gaming and video applications

WiFi 6 also includes embedded cybersecurity, managed network services and parental controls.
This feature is available with the Greenwave C4000 modem/router.

CenturyLink Product Support