Wi-Fi is radio waves, so it might happen that the router is placed far from your devices and obstructed by other appliances and devices due to which the issue arises of Wi-Fi not working Spectrum. Here are some of the ways through which you can fix the problem.
How to fix Spectrum router error?
Check for any physical blockages that may be interrupting the connectivity.
Ensure none of the connections are loose of damage wires.
Click the reset button on your router for a few seconds.
Try restarting your router.
Make sure you are entering the correct credentials.
Try rebooting and updating the firmware.
Reset the router back to factory default settings.