Constant red light on router

Hi there, I’ve had persistent issues with WiFi for the past couple of months with several engineers allegedly working on a fix in the area. I’m on the verge of leaving after c 15 years as I’m a bit sick of it but I just wondered if the constant red light on my router might also have something to do with it. No one I speak to on the phone seems to care about it but it doesn’t seem normal to have a constant red light (even when the WiFi is working as it should be). I’ve asked for a new router previously and been told that they need to fix the area issues first…still waiting…