Xfinity Modem Solid Blue Light: Meaning & Fix
Quick Conclusion
A solid blue light on an Xfinity modem (e.g., XB7, XB8) indicates the device is fully operational and connected to the Xfinity network, with no active issues. This is a normal status for routine operation, not a failure or outage, and signifies that internet service is available for use.
Engineer's Pro-Tip
Xfinity modems like the XB7 and XB8 have a hidden diagnostic mode: press and hold the reset button for 30 seconds until lights flash in a specific pattern, then release to run a full hardware self-test; this can reveal underlying issues not shown by the solid blue light, accessible via the admin panel at 10.0.0.1 under 'Troubleshooting'.
Community FixReddit
"How do I get hue hub to accept new Ethernet port?"
You’ve got a networking problem, not a hue problem. If turning the hue hub off and on again doesn’t get it reconnected, then you need to look at what your switch and router are doing. I can’t give you step-by-step instructions because you haven’t said what kit you have, or how you’ve configured it. But it sounds like your hue hub isn’t getting an IP address from the local network.
Read original threadWhy is this happening?
- Successful completion of the boot process and establishment of a stable DOCSIS connection to the ISP backend.
- Normal operation after a firmware update or provisioning from Xfinity's network.
- Steady state with all services (internet, voice, video) activated and functioning properly.
- No errors or alerts detected in the modem's internal diagnostics or from the ISP's monitoring system.
Step-by-Step Fix Flow
Verify Internet Connectivity via Device Test
Connect a device (e.g., laptop) to the modem via Ethernet (use the yellow port labeled 'Internet' or 'WAN') or Wi-Fi, then open a browser to test if websites load. Alternatively, use the xFi app to check service status under 'Network Health'.