I currently have an AT4 that constantly goes to Tuner Not available. Once you get that message, the only thing you can do is restore the Apple TV and set it back up to use the Channels App. This is the only way to get rid of the message. It loads the guide icons as if you can actually watch the channel. Everything seems normal. The signal is good and the router is in the next room. I get all 5 dots on the network test. Netflix, Hulu, Plex all play normally. Even removing the Channels app and putting it back does not fix the issue. It seems to remember settings from iCloud or one of the other Apple TV’s.
You can do a scan for tuners on network and it will find my two HDHR Primes without and issue. Scans for channels without an issue. I’ve even tried switching back and forth between the two Primes and nothing. When I look at the HDHR’s there are no channels in use as the tuner LEDS are blank. I can start one of the other AppleTV’s and one of the LEDS light up. I’m not understanding what’s going on with this thing. I returned the previous Apple TV because I thought it was the problem. Turns out it’s not.
I have 2 other ATV4’s that do not have this problem. I can use the HDHR view app and Windows Media Center an never get this message. I only used WMC because Silicondust asked me to test it.
2 HDHR Primes (6 Tuners)
Each Apple TV is named something different to indicate which room they are in. If anyone has a solution, please let me know. Restarting the HDHR’s and removing the cable cards do nothing.