Xfinity Router Blinking Blue Light: Meaning & Fix
Quick Conclusion
For Xfinity XB7 or XB8 gateways, a blinking blue light indicates the device is in the boot-up or firmware update process, which is normal during initial setup or after a reset. If it persists beyond 10-15 minutes, it may signal a provisioning failure or hardware issue requiring ISP intervention.
Engineer's Pro-Tip
Xfinity XB7 and XB8 gateways have a thermal management system that can cause erratic blinking if overheated; ensure at least 6 inches of clearance on all sides and avoid placing near heat sources to prevent false hardware failure indications.
Community FixReddit
"FP2 Drops WiFi Whenever Linksys Router Reboots, Stuck Re-Pairing Every Day"
What I have found with these “HomeKit” routers is that it’s actually better to not have them in HomeKit. Apple hasn’t ironed out any bugs for it in years and it always causes issues.
Read original threadWhy is this happening?
- The gateway is booting up after a power cycle or factory reset, initializing its DOCSIS and Wi-Fi modules.
- A firmware update is being downloaded or installed from Comcast's backend, which can cause extended blinking.
- A provisioning error where the gateway fails to authenticate with Comcast's network, often due to incorrect MAC registration.
- A hardware fault in the modem or router component, such as a corrupted NVRAM or failing power supply.
Step-by-Step Fix Flow
Wait for Normal Boot Completion
Allow up to 15 minutes for the gateway to complete its boot sequence. Check the xFi app for status updates; if it shows 'Activating' or 'Updating,' wait without interruption.