I have a royal fireplaces r-maxin and the remote to control the fireplace turning on and off with a thermostat is no longer turning on the fireplace. It’s a heat n glo smart stat t. The on/off switch is still controlling the fireplace’s functionality. The remote is able to communicate with the receiver device below the fireplace. I know this because when switched from auto to off the red light turns on and off. I changed the batteries in the remote and followed all of the troubleshooting recommendations to no avail.