Hi welcome to just answer.
The first thing I would suggest is to check if you remote is transmitting the IR signal. Below is the link showing how to test the IR portion of your remote.
If batteries are good and installed properly and you do not see the IR image, then I would suggest replacing the remote control. Below is the link for getting a replacement.
If you feel that my answer has solved your problem, please rate my answer as this is the only way I get credit for my time.