How to Solve LOS Light Blinking Red on Huawei Router?

Today, having problems with your Internet connection is definitely on the top of the most frustrating things list. You browse the internet, or try to send an email, or you are in the middle of an online class, and all of the sudden you can’t do anything more. The computer reports that there is no internet connection. You take a look at your router and you see the LOS Light blinking red. 

This article is intended for Huawei router users and we are going to cover the meaning of the LOS light blinking red, what might be the causes and of course, present several ways to fix this problem and get your internet connection up and running.

On the other hand, if you don’t use a Huawei router, but the LOS light is red on your router, keep reading. Maybe one of the solutions will help you fix your connection too.

LOS Light On Huawei Router

LOS Light Blinking Red: What Does It Mean?

First of all, LOS stands for Loss Of Signal. When everything functions properly this light should be off.

When you see the LOS Light Blinking Red on your router it usually indicates there is a problem with the fibre optic connection.

What May Be Causing The LOS Light Blinking Red?

There are several different reasons why you are seeing the LOS light blinking red on your Huawei router.

Some of the most common are: loose cables and connectors, damaged cable or cable pins, or your optic cable has been bent abnormally. On the other hand, maybe your ISP is experiencing some problems like a power outage, or is just performing scheduled maintenance on their network system.

When you know the reasons for the red blinking LOS light on the router, you can easily try to look for a solution in the right direction. And here are some tested solutions that have helped most users fix the problem they have.

How To Fix LOS Light Blinking Red On Huawei Router?

Have You Paid The Bill?

To be honest people lead a pretty busy life these days so it’s normal to forget something. In this case this applies to paying the bill for the internet services. If you don’t pay in time, your ISP will cut the signal after some time. This will result in loss of signal which leads us to the main problem we have.

So, if you have forgotten to pay the bill, you know what you need to do. But if you have paid the bill on time and you are sure this is not the reason for the LOS light blinking red, check the following solutions.

Check the Fibre Cable Connection

At this point you need to check if the fibre cable is properly connected. Make sure to check the end that goes into the router as well as the end going into the wall socket.

Check If The Fibre Cable Is Damaged

The fibre cable is pretty sensitive and can be damaged easily. For example, if we bend it excessively by accident, it may result in loss of signal. Therefore, while you are checking whether it is properly and firmly connected, you can also check for any unusual bending or visible damage.

Reboot The Router

When you confirm that there is no damage on the fibre cable and that it hasn’t been bent abnormally, it is time to reboot the router. This is a simple procedure that fixes most problems with electronic devices, including our networking equipment.

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So, connect the router from the power source. Leave it disconnected for 10-20 seconds. You can also leave it disconnected for much longer if you want. Then. Connect it back to the power source and leave it to boot up completely. After some time, check the LOS light. It should be off now. However, if it’s still blinking red, try the following solution.

Contact Your ISP

We have already mentioned that the problem might be on your ISP’s side. You can check this in several different ways.

One is via your ISP’s official app or website; the other way is using third-party websites that report issues and outages in real-time. You just need to type your ISP’s name there and see whether other users have reported to have problems with their services. And finally, you can get in touch with your ISP support team and ask for help.

Contact support

Contacting the ISP support is recommended because they can tell you whether they are affected by a service or power outage, or maybe they are upgrading or maintaining their network. In such cases they can inform you when they fix the problem.

Also, if they say there is no outage or any service disruption on their side, you can ask them to test or restart your connection, as well as assist you in fixing the problem. Finally, they can even send a technician to resolve the issue, and even replace the router with a new one.

Final Words

You can expect to see the LOS light blinking red on your Huawei router from time to time. It can be a really annoying experience but when you know what to check and do it gets a bit easier.

Maybe a simple cable check or reboot will help you diagnose and fix the problem. Or you will have to ask the tech support to guide you through the troubleshooting steps. Or maybe you will just have to wait for a notification that the outage has ended. Yes, it can be stressful, especially if you are in a hurry, but the good thing is that it can be fixed. After that you can continue with your everyday online activities.

7 thoughts on “How to Solve LOS Light Blinking Red on Huawei Router?”

  1. Our company is using same modems by Hauwei.
    issue is internet working with Lan perfectly although their is LOS Light Blinking. PON light is stable. Wifi stopped working.
    when i access the modem & try to enable wifi , its giving me error.
    2 days ago i replaced router. installed new one, But same issue

  2. I activated automatic shutdown, I didn’t know it was doing it and now it shows me los on the routes, I reset the driver but nothing happened

  3. thank you so much!!! Today earlier faced such an issue and couldn’t fix it myself. I was reading your article and the part with bent cables left me in question. I was like ” how can be possible to lose connection with bent cable, let me check again?” apparently problem was exactly due to that. Thank you again very simple explanation and useful.


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