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Moved my X1 DVR to new room and TV. I am getting error code RDK-03003 alternating with RDK-03030. I have done what it recommends and also read on some of the forums with same issue. I have pushed to Blue button for Reboot. I have unplugged for brief time and also for several hours and nothing changes. Same error messages. The DVR box has been recently replaced and worked fine before the move
This sounds like the cable wallplate you moved the DVR to is not LIVE... you can try to look inside the wallplate to endure there is a connection, or go to where your cable homeruns/feed is located to ensure that line is connected. If uncomfortable doing this, you can call an A/V technician or call into Comcast for a service visit.
Regardless of what the tech told you, RDK-03003 means that particular box has an unusable connection or no connection at all to the Comcast network. As Ray said, ir sure sounds like that outlet is not live or it is getting really poor signal. Something may have changed since the tech was there last.
Call Comcast and have them send a tech out.
When the tech was here recently replacing the X11 box, I had him check that cable.
He told me it was live. It was new cable run about a year ago when I had a renovation done.