It is possible that while you are trying to control your tv using the spectrum remote the option of controlling the tv is not even enabled.
Spectrum cable box controller.
Enabling control of tv.
How to pair spectrum remote to cable box this is for pairing your remote to your cable box if you have service with spectrum charter remote model sr 002 r.
Hold your spectrum remote control close enough to face your cable box.
If you have the correct codes to program your spectrum remote this method is the easiest for you.
To assign volume controls to the spectrum cable box press mute.
This might be very frustrating as you will be performing all the actions correctly you would be able to control the spectrum cable box but not the tv.
Ensure you turn on your cable box.
How to program spectrum remote to cable box using the code manual method.
So you can set a max volume on the tv and just use the cable box to control the volume up to that setting.
But i cannot get it to work either from the remote or by hitting the volume up and down buttons right on the cable box.
The remote that spectrum supplies with the current boxes only communicates over an ir link to the cable interface.