＊The remote control address is not correct.
＊Check that the batteries are installed correctly in the remote, making sure that the polarities of the batteries are not reversed.
＊Make sure the batteries are fresh and are not out of power.
＊Make sure the remote has not been tampered with.
＊Make sure that the distance of remote control is not too far or the angle too deviated.
＊Check around and make sure there are no fluorescent lamps in use.
＊Remote Control is damaged or the front panel of DVR is damaged.