Make sure the ONT or router is powered properly and indicator lights are on. The LOS light on your router indicates the status of your internet connection to the Internet Service Provider (ISP). Don't panic—in this step-by-step guide, I'll walk you through all the proven fixes, from simple reboots to checking your fiber line, to get your. If the LOS light on your fiber router or ONT is blinking red, it usually means Loss Of Signal. This guide explains the likely causes, the checks you can do at home, and when the issue needs technician support. However, if the light is Solid Red, your device might be suffering from a critical.
