Basically, there can be an uncountable number of reasons for the red light on Linksys router error. From connectivity issues to outdated firmware versions, every simple point can cause this error. Also, if you are literally a non-technical user, you will remain unaware of the actual reason for the red light. So, to get that fixed, it is mandatory to check the actual source of the erro... https://linksyswifiextender.net/red-light-on-linksys-router-cause-and-solutions/