Is your hopper full? When the hopper is full, the diverter will send all coins to drop door. There is a "screw" that is removable. Has a cable attached to it. You can move it up and down the hopper (it has holes depending on how high the hopper level is allowed to get). If there are coins touching the other side of this screw inside the hopper, then it is closing the switch causing the coins to go to drop door. You can move the screw up another level or 2 if that is the case, otherwise, it could just be a stuck diverter.