Be sure that the sensor area in the bed of the conveyor is clean and free of all debris. More often than not this is merely a battery issue. Be sure to use brand new, out of the pack batteries. NOTE: Be careful with the battery placement. It is a little hard to see the + and - signs down deep in the battery compartment, and there is no spring in the lowest cavity, thus resulting in common placement error. Try following these written instructions:
1. Remove the batteries.