A red light means that your modem cannot detect internet signals and is unable to connect. It can be used as a signal that the device is powered on. However, this is not a common color for your modem. Here are some troubleshooting tips to fix the red light that appears on your modem.

Every manufacturer has a slightly different set indicator lights. These lights can have different meanings depending on which model you are using. Modem lights tend to be bright green. Red light often indicates a fault or problem.

Although most modems have a blue power light to avoid confusion and omissions, some modems have a similar red power light as other electronics. It is possible that your manufacturer has a red power light. It might be normal.

The most common indication of a red light on your modem is:

  • No DSL/Cable signal detected on the line. The internet may not be working or it may be slow.
  • Failed authentication at your ISP. Your modem can still connect to the Internet, but your account cannot be recognized. If your modem doesn’t have that option, enter your credentials again. Contact your internet Service Provider (ISP).
  • Modem malfunction If you rent the modem, call the manufacturer.

How to Fix the Modem’s Red Light

If your modem is showing a red light, follow these troubleshooting instructions and try each step. If the red LED turns off, or becomes green or amber following one of these steps then your internet is working. If your internet works, then you don’t have to do any more steps.

Here’s how to turn off the red light in a modem.

  1. Restart your router. Then, unplug your router/modem and wait for it to turn off. Let the lights turn on for at least 30 seconds and then check to see if it goes off.
  2. Your connections should be checked. You can check your coaxial connections with your cable modem. Make sure they aren’t corroded and tight. DSL service is possible. Check the phone line connections to the modem at the wall and make sure they aren’t frayed. Fix any loose connections. You might also need to reset your router after fixing it.
  3. Consider switching to a new cable or phone outlet. If you have multiple telephone or cable outlets in your house, try connecting to a new one. If none of these work, your wiring may be damaged or your connection to the phone line or cable.
  4. Consider switching to a different cable/phone cord. It is possible to swap an existing phone or coaxial cable for a different one.
  5. Your internet credentials should be checked. Verify that you have entered your ISP login credentials correctly in the modem admin portal. If it doesn’t, your ISP will need to verify that the modem is properly provisioned.
  6. Contact your modem manufacturer. It could indicate an internal defect. If it does, your modem will need repair or replacement. If it does, the manufacturer will tell you.
  7. Contact your ISP. If the red light continues to flash, contact you ISP. They can tell you if your internet connection is down, noisy or other issues that are not your fault. If you rent your modem through the ISP they will be able to replace it.


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