Call them at the phone number on your bill or 1-800-Comcast, or chat with them using one of the "Trouble" options at https://www.comcastsupport.com/chatentry/. Ask them to check the account setup and send a refresh signal to the box. If they can't fix the problem remotely, insist they send a tech out to identify the cause and correct it.
If the tech finds bad coax, splitters, amplifiers, or connections in your home (even if Comcast originally supplied them) you'll probably have to pay for the visit unless you have or sign up for their Service Protection Plan (https://www.xfinity.com/support/account/service-protection-plan/, about $6/mo) and keep it for at least 60 days. If the trouble is due to a faulty Comcast cable box or DVR, or anything outside your home, you shouldn't be charged.
Hello bruinsnut, error code CL-0x000f is a signal issue more than likely caused by something within your home. We would need to get a tech out to correct this problem, can you please send me a private message with your full name, street address, and account number by clicking on my name (ComcastAmir) and then "private message me"?
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I am an Offical Comcast Employee. Official Employees are from multiple teams within Comcast. We ask that you post publicly so people with similar questions may benefit. Was your question answered? Mark a Best Answer!
I am a Comcast Employee. Please post so people with similar questions may benefit.