Why is My CenturyLink Modem Blinking Blue? And How To Fix it?

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Last Updated on July 22, 2023

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CenturyLink Modem Blinking Blue

Century Link has a unique disposition of providing some of the best customer service and internet speeds. There’s a lot to enjoy with their feature-packed devices that come streaked with bundles that have something for everyone. We’re big fans of the service and we want you to have the very best of it. 

Century Link modems come equipped with the latest and greatest technology so your devices can get supplied with the fastest speeds. But as with any electronic device, they can get affected by issues every now and then.

One of these is the notorious blue, blinking light that often confuses users. Follow us in this short but informative guide for helpful troubleshooting tips. For modem problems require modem solutions.

The Case of Lights In CenturyLink Modem

Century Link designs its devices with customers’ best interests in mind. This means they’d want to give you the best coverage and the best configuration with minimal possibility of confusion.

Century Link modems come with blue, bluish-green, red, and even white light. Each of these colors represents its own case and its imperative to know the why and how of their occurrence. 

The ideal status of your modem lights should be green because it represents that the indicated feature is working optimally.

Similarly, blue isn’t always wrong but it acts as an indicator to find out why the function isn’t green. Prolonged periods of blue light blinking can have adverse effects on your internet connection. 

The Blue Light

This light is a midway of sorts. It first shows when the modem is restarted or is powering up. The blue light indicator starts flashing when the modem shows it is establishing a connection with the internet.

However, this isn’t much of a problem when you have internet as functionally efficient as Century Link. Century Link internet plans also offer good bonuses and discounts for select plans that keep on updating and evolving with delicious offers for its customers. 

Of course, each modem comes with its respective hardware but the configuration is the same. Blue light remains an indicator for connection establishment and it’s crucial that this gets stable eventually and turns green.

Additionally, there can be problems that may be indicated by blue light as well.

ISP-specific problems may be represented by a blue stable light that never turns green. Speed throttling, old firmware, and improper connections are all indicated by the color blue.

How To Fix an Idle/Flashing Blue Light In CenturyLink Modem?

Fix 1: Restart

A quick and sure-shot solution. At least 90% of the time. Put your modem through a restart cycle that refreshes its internal system and gets rid of any temporary bugs that may be causing a problem.

Minor issues don’t stand a chance when this happens and it can save you a lot of headaches too. Easy fix, within minutes.

Fix 2: Check the Wiring

Sometimes, an issue might be right under your nose but you may never notice it. ISP and modem may be working as intended but the wiring could be loose or damaged. This often happens when the modem happens to be situated where there’s a lot of foot traffic. 

Your wiring may become subject to wear and tear or even come off entirely. It’s a good habit to have a look at your hardware and its connections before digging into the specifics of the issue.

Fix 3: Internet Provider Issue

Often times there’s a chance the issue may not even be originating in your premises. Internet providers have the liberty to switch off your modem’s internet connection for explicit reasons.

These can range from bills not paid or customers acting up. This is however very unlikely because companies like Century Link make it a point to keep their customers updated with information pertaining to them.

Power outage on the internet provider’s end may also result in this but in that case, a blue light will seldom come on. This will be replaced by a red light which is the sole indicator of a power outage and no connection.

Fix 4: Overheating of the Modem

Alas, modems are electronic devices. They function for specific tasks and can get overheated too if they’re burdened with a lot and not provided a cool enough surface.

Sadly, unlike computers, they do not have fans to let them cool off when they want to so one must be wary of when a modem overheats.

On the occasion it does, the modem would probably opt for displaying a blue light showing that it cannot function optimally and a change of environment is needed.

Fix 5: Firmware Update

Modems undergo updates as well. These can be for bugs, troubleshoots, and even performance enhancements. If this is the case for your modem, there’s a good chance it will display a blue light that is blinking while it is updating. 

Additionally, it can also blink as the modem’s way of notifying the user that it is currently undergoing an upgrade process or that the process has stopped midway which has rendered the device useless for the time being.

You can always restart this process or contact customer support or flash a new software on your own if you’re that tech-savvy.


At the end of the day, modems are electronic devices and they should be treated as one as well. We shouldn’t forget that even though they are powered on throughout the day, they are prone to downtime.

This can be in the form of any of the above-discussed points. Regardless, Century Link has a plethora of features and apps to help maneuver its user through any FAQs they might have and their modems always have a reason for the way they would be acting. It always helps to be on top of their case though. 

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Rahul Choudhary is a technology and troubleshooting expert. He gives his expert opinion on different technology trends and provides troubleshooting guides for different apps, websites, & consumer hardware products. He graduated in BA English Honours from the University Of Delhi, and later he learned HTML and WordPress. He also did a certificate course in Hardware and Network Troubleshooting , and a certificate course in Computer Architecture.