If the remote control can change between a few channels on the television, the remote control is operating correctly. The channels that cannot be accessed need to be stored in the television in order for the remote to access them. Autoprogram the TV tuner to resolve this issue.
NOTE: An easy way to verify the channels that are stored into the television tuner are to press the channel up or channel down buttons on the television. This will show the channels that are programmed into the television tuner.