Thanks for letting us know about the issue you're experiencing.
We suggest re-pairing the new remote to your TV to see if that helps. Here are the instructions you can follow:
If your remote uses standard batteries, open the battery compartment and remove the batteries.
Remove the power cable from your Roku device, wait 5 seconds, and then reconnect the power cable.
Wait until your Roku device displays the home screen.
Restart your remote.
Standard batteries: Reinsert the batteries into your remote.
Press and hold the pairing button for 5 seconds until you see the status light begin to flash. If the light does not flash, try again. If the light still does not flash, charge your remote or replace the batteries.
Wait for 30 seconds while the remote establishes a connection with your Roku device.
The remote pairing dialog should appear on your TV screen.
Re: My new Roku remote will turn the volume down but not up, any ideas on how to fix this?
@RokuKariza-D I’m having the same problem. We’ve had the remote for about a year and it was controlling the TV power/volume functions with no issues. Suddenly, the volume function quit working. I have unplugged the Roku device, did a system reset, repaired the remote to the device, and followed the steps to set the remote up for TV control. The remote is now able to control the volume down and mute functions, but it will not turn the volume up. What’s the deal? Glitch with a recent update maybe???