What to do if the fiber optic cable on your router is red

A red fiber optic light on your router indicates a loss of signal, often caused by cable issues, ISP outages, or router problems, and can usually be resolved with basic troubleshooting.Check for Service OutagesBefore troubleshooting your equipment, verify whether your Internet Service Provider (ISP) is experiencing a local outage. Visit their website, social media pages, or call customer support to confirm if the red light is due to maintenance or network issues .Inspect the Fiber Optic CableLook for physical damage such as cuts, bends, or kinks in the fiber optic cable.Ensure the cable is securely connected to the router's WAN or ONT port.If the cable appears damaged, it may need to be replaced .Reboot Your RouterTurn off the router and unplug it from the power source.Wait 30 seconds to 1 minute, then plug it back in and power it on.Check if the LOS light turns green, indicating the signal has been restored .Check All ConnectionsEnsure the power cable, LAN cables, and fiber optic cable are firmly connected.Tighten any loose connectors gently but securely.If using a surge protector, try plugging the router directly into a wall outlet to rule out power issues .Update FirmwareOutdated router firmware can sometimes cause connectivity issues.Use your router's app or web interface to check for and install any pending updates .Reset the Router (if necessary)Locate the reset button on the router, usually a small hole labeled “Reset.”Press and hold the button for 10–30 seconds using a paperclip or pin.Be aware that this will erase custom settings, so have your ISP credentials ready to reconfigure the router .Contact Your ISPIf the above steps do not resolve the issue, contact your ISP. Provide them with:The LOS light status (blinking or solid red)Observations about the cables or routerYour account details for faster support By following these steps, most red fiber optic light issues can be diagnosed and resolved without replacing the router. If the problem persists, it may indicate a faulty router or damaged fiber line that requires professional repair.