Fruit Machine Chat

i have alarm 13 and 16 keeep coming up on the machine i think it might have something to do with the hopper as when i disconect the hopper seems to boot up fine any help would be much appricated thanks

first 56 cam up then 6 then 3 im so confused i take the hopper red onnector off it starts fine with the door open then when i shut the door error 6 comes up might be 16 i dnt no disply funny please could someone help me