Visitor
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2 Messages
New install, blinking yellow light on modem
Background Info:
- There is an existing Xfinity modem within my household under a different account
- I chose this plan for easy install, especially given there is already a connection to our house
- I received and attempted to set up the modem the same day, 12/15/2025
Things I tried (in order)
- Normal activation: Scan QR code > plug in coaxial cable in upstairs outlet and modem > plug power cord in upstairs outlet and modem >wait five minutes [Light goes from solid yellow light to blinking yellow light]
- Double checks all wires to ensure they're secure
- Unplug everything > wait a few minutes > plug everything back in > wait five minutes [Light goes from solid yellow light to blinking yellow light]
- Unplug everything > wait a few minutes > Enter CM MAC manually > plug everything back in > wait forty-five minutes [Light goes from solid yellow light to blinking yellow light]
- Unplug power cord > wait a few minutes > plug power cord back in > wait five minutes [Light goes from solid yellow light to blinking yellow light]
- Check for outages in my area via Xfinity AI Assistant > says there are none
- Troubleshoot via Xfinity AI Assistant > says no issues, suggests scheduling with technician > choose not yet, would like to resolve on my own first
- Unplug everything > go to existing modem downstairs (kitchen) > unplug existing modem > replace existing modem with new modem > scan QR code > plug in coaxial cable in wall and modem (used existing modem's coaxial cable) > plug power cord in wall and modem (used new modem's power cord) > wait five minutes [Light goes from solid yellow light to blinking yellow light]
- Unplug everything > return upstairs > scan QR code > plug in coaxial cable in upstairs outlet and modem > plug power cord in upstairs outlet and modem > wait five minutes > hold reset button for twenty seconds [Light goes from blinking yellow light to blinking blue light, before returning to blinking yellow light]
- Wait five minutes > hold reset button for twenty seconds again [Light goes from blinking yellow light > solid green light > rapid blinking green light > solid yellow light > blinking yellow light]
After this final attempt, I left it plugged in overnight hoping it just needed more time. I checked again around eight hours later and there are no changes. I am now at work, and it is still plugged in. I would prefer not bringing in a technician, but if absolutely necessary I suppose I don't have a choice. Hope to see a response soon!
atatuaia
Visitor
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2 Messages
3 months ago
Late update: When I got home from work and errands, it was still blinking yellow. I’ve unplugged it and its now sitting in my room.
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EG
Expert
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116.9K Messages
3 months ago
Concern moved here to the Customer Service help section for greater exposure to Comcast corporate employees (The Digital Care Team) for assistance.
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user_1v4ht5
Visitor
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1 Message
9 hours ago
Just went through the same process as you, after moving to a new house. After an unreasonably long time of trying all of the advice I could find, I gave up and scheduled to have a tech come out. So much for plug and play.
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