Whenever a modem flashes a light, it indicates that it is facing some technical errors. Even if the technical issue isn’t that big of a problem, you should fix it as soon as possible. The red blinking light basically indicates that the WiFi is not working and the router is not able to establish a good and stringent Internet connection. A blinking red light leads to the modem not operating normally and facing some errors. In order to fix the error of Spectrum modem red light , you can power cycle the router and modem, reboot the Spectrum modem and router, and reset the Spectrum router. Also, don’t forget to check if the cables and cords are in good condition or not. Because if they are damaged, you must replace them.