To resolve the issue yourself, follow the steps below or watch the video.
STEP 1: Many issues, such as missing channels, can be fixed by “refreshing” your receiver. Please visit the My Equipment page and then select the Refresh Receiver link next to the receiver you’re having trouble with.
Still seeing Error Code 721 on your TV screen? Try Solution 2.
Solution 2: Check your channel lineup
STEP 1: Sign in to directv.com
STEP 2: On the My Overview page, select View Channel Lineup.
STEP 3: If the channel you’re trying to watch is not included in your programming package, select Change Package to easily upgrade your package.
Still seeing Error Code 721 on your TV screen? Try Solution 3.
STEP 1: Unplug your receiver’s power cord from the electrical outlet, wait 15 seconds, and plug it back in.
STEP 2: Press the Power button on the front panel of your receiver. Wait for your receiver to reboot.
STEP 3: Go to My Equipment to refresh your receiver again.
Still seeing Error Code 721 on your TV screen? Please call 800.531.5000 for assistance.