Try this procedure from the Programming Guide:

Remove at least one battery from the remote. Now, while holding the [VOLUME-] and [CHANNEL-] keys simultaneously, re-install the batteries and then release those two keys. The remote will display "EEPRON TEST OK SPI" on screen and flash the transmission icon continually. Again, remove at least one battery, re-install it, and the remote is cleared.

Hope this works for you. Good luck!