How To Troubleshoot Xfinity Modem Red Light. As far as routers, cable boxes, modems, or gateways (combination of a router and modem), LED lights are concerned, they are designed to give you information based on the color of the lights.

On the other hand, if you see a red light on any device, it is almost universally considered an indication of something wrong. If your Xfinity modem displays a red light, it is not a good sign. 

You will have to unplug your Xfinity modem, restart it for a soft reset, or perhaps you will have to force it to reboot for a hardreset, which will return it to factory settings.

If the red LED light on your modem is flashing, then it means the modem is no longer connected to the internet.  # How To Troubleshoot Xfinity Modem Red Light

What causes the Red LED light on Xfinity Modem?

The reasons behind the inability of your ISP (Internet Service Provider) to establish an internet connection may be attributed to a number of factors, such as maintenance or something caused by a freak thunderstorm or even an accident, as well as problems on your ISP’s end.

When Xfinity My Account is installed on either iOS or Android phones, you will normally be notified of any outages that may occur in your area.

The problem could be a technical issue with your lines, or even a billing issue with your account, that has caused Comcast to pull the plug on your internet service. There could be a problem with splitters, cables, plugs, and even the cable modem itself causing the problem.

There is no doubt that you will have to work your way through each and every one of these potential problems to create a process of elimination in order to get to the bottom of things.

There is no point in spending a lot of time troubleshooting if you are not able to find the answer long before you finish all of the possibilities.  # How To Troubleshoot Xfinity Modem Red Light # How to Fix Red Light Issue on Xfinity Modem

How to Fix Red Light Issue on Xfinity Modem

Xfinity modems may display a red light when there is a problem with the modem, and you can take a few steps in order to resolve this:

  1. It is often useful to restart your modem by unplugging it from the power outlet for about 30 seconds and plugging it back in again. This can sometimes resolve minor connectivity issues.
  2. Ensure all cables are securely plugged in, and replace any damaged cables if necessary.
  3. Find out if your area is experiencing any known service outages by visiting the Xfinity website or contacting customer service.
  4. Xfinity website or customer service are both good places to check if your modem’s firmware is current.
  5. Attempt to reset the modem to factory settings if nothing else works. When you reset the modem, any custom settings you’ve made will be erased, so make sure you make a note of your login credentials and any other important information before you do so.
  6. If the red light problem comes from your device, consult the manufacturer’s website or its documentation for troubleshooting instructions.

Xfinity customer service is able to diagnose the issue and offer a solution to resolve it, if the above steps do not resolve the problem. If the above steps do not solve the problem, it is best to contact Xfinity for further assistance.

How To Troubleshoot Xfinity Modem Red Light
How To Troubleshoot Xfinity Modem Red Light

Soft Reset the Xfinity Modem

The process of performing a soft reset can be accomplished in a few different ways. There are a couple of things you can do. First, you can simply unplug the device for two minutes, then plug it back in after it has elapsed.

Since the power supply did not have an issue, the modem should be able to cycle back up normally now.  # How To Troubleshoot Xfinity Modem Red Light

The LED light of the device should be red at this point, so if it returns to red after cycling back up, then the soft reboot did not correct the problem.

This can also be done by taking a paperclip, unfolding it, and inserting it into the tiny hole on the back of the modem. When you insert the paperclip into the tiny hole, you will feel a pressure click as the paperclip presses on the button beneath.

Please hold down the reset button for thirty seconds while you unplug your modem, wait a few seconds, and then plug it back in again, while at the same time holding down the button. You should continue to hold down the button for the entire thirty seconds. 

If you use this method, it will set the modem back to a blank slate, as well as remove any caches and temp files it has accumulated over time.

For the most part, this method is the best way to start with a modem with a lot of bells and whistles. 

Checking the power source

In most cases, the problem isn’t the outlet itself that is causing the problem; instead, it’s something that has been plugged into the outlet that is causing the problem.

For the most part, it’s not the outlet itself that is causing the problem, but what you have connected to it.  # How To Troubleshoot Xfinity Modem Red Light

As we discuss the topic of multiplug outlets, we are drawing attention to the fact that these outlets extend the number of devices that can be plugged into a wall outlet. These are often the things that can create issues.

Possibly they were made cheaply and are having problems, which is causing the power to come through to be much lower than it should be. 

There is nothing worse than an inconsistent signal flow in a modem. 

Check the cables and wires

Getting backwards from the modem means diving into that tangled mess of wires because, for some reason, everyone always likes to plug everything right next to the modem, so you will have to work your way backwards.

Basically, what you need to look for are shoddy connections, crimped or bent lines, and damaged lines that indicate shoddy workmanship. # How To Troubleshoot Xfinity Modem Red Light

I believe that this is much more common than you may realize, as things get moved around during cleaning and cords and cables coming out of the back of the modem and router end up being beaten up against the wall and forcefully redirected at a 90° angle.

Contact Comcast

There are many times when the problem is caused by the Internet Service Provider.

It is very important to contact Comcast if you notice a RED light on your cable modem, because it means that something is wrong.

If an outage were to occur in the area, it would not be your fault or any of your equipment’s fault if you were noticing the red light.  # How To Troubleshoot Xfinity Modem Red Light

The good thing about Comcast is that they can clear up a lot of things from their end that you are unable to do from your end on your own anyway if it’s not something on Comcast’s end. 

Restart your modem

If you power cycle your computer, you will probably be able to resolve the issue in a couple of minutes. # How To Troubleshoot Xfinity Modem Red Light

As the router is an electronic device, restarting it will bring it back to a blank state and clear any background processes that have been running as a result of the router being an electronic device. 

The best way to unplug your modem is to remove the power cord from the socket with the modem. After doing that, wait for a few seconds before pressing the power button.

If you want to restart your modem properly, you should hold the button down for a good 30 seconds.

Usually, if you have a minor issue like this, your connection will be restored as soon as you do this.


It is important that you take note of the flashing red light on your Xfinity Router that indicates your internet connection is not working.

It is possible to try the troubleshooting methods mentioned above, but if those fail to resolve the issue, it is most likely a problem on Comcast’s end, and you will have to wait for them to resolve it.

You might need to contact Xfinity Tech Support if none of the methods listed above appear to be working for you. If you haven’t been able to resolve the issue with your router, there might be a technical issue with it.