First you cover two of the receivers, while you switch the other.

Leave the R15 set to code 00001.

Switch the H21 to code 00002. Start by programming code 00002 to AV1 on the remote:

1. av1
2. press and hold MUTE & SELECT for two blinks
3. enter 0 0 0 0 2

Now slide back to the directv device and enter the menu of the receiver:

1. menu> parental, fav's, & setup> system setup> remote> receiver mode>
2. you will see either Directv or AV1/AV2, click whichever to reveal both
3. chose Av1/ AV2, the remote will stop controlling the receiver, slide back to AV1 which has code 00002
4. press DONE, exit the menu

Now with R15 & H21 covered, switch the HR20 to code 00003:


1. av2
2. press and hold MUTE & SELECT for two blinks
3. enter 0 0 0 0 3

Now switch back to the Directv device and enter the menu of the receiver:

1. menu> parental, fav's & setup> system setup> remote> advance setups>
2. press DASH key on the remote, its the key left of the zero key.
3. click on the Receiver #, to reveal a drop down menu, scroll to Receiver 3, thats if you are actually using code 00003 for the HR20 receiver, if not then it would be on of the following:

Receiver 3- 00003 on the remote
Receiver 4- 00004 on the remote
Receiver 5- 00005 on the remote
Receiver 6- 00006 on the remote
Receiver 7- 00007 on the remote
Receiver 8- 00008 on the remote


4. click on continue, the remote will no longer control the receiver, slide to AV2 on the remote which should have the code that matches Receiver # you picked in step two above

5. done and exit the menu