If your Gree remote control still doesn't work after replacing the batteries and disabling the privacy lock, there are a few troubleshooting steps you can take. First, make sure that the remote is pointed directly at the indoor unit's receiver or receiving window when pressing buttons. Additionally, check that there are no obstructions blocking the signal and that fluorescent lamps or light sources in the room are turned off. Understanding remote control functions and buttons can also prevent accidental lockouts in the future.