Although Xfinity router ensures it can handle some bugs but here are some quick fixes for Xfinity Wi-Fi router not working. Here are some ways to ensure your router is working. Steps to resolve Xfinity Wi-Fi not working:

 Restart your modem through My Account online, go to the internet service tab, scroll down to devices and select restart modem. Start Troubleshooting which can take up to ten minutes.  After restarting make sure your device is plugged in properly to a power source.  Ensure your account updated.  Try moving closer to the router for better connectivity.