Milk Jug toss has an error routine during the boot up sequence to check the sensors on the game for proper operation. When the game boots it sends and enable signal to the sensor which causes the signal line to go low. If a sensor has not reported the signal line low it will then flag the sensor as in error. The game has 3 critical errors that will stop the game from booting Jug sensor 1 (error 18), jug sensor 2 (error 19) and the conveyor safety sensor (error 20) all other sensor errors on the game will be checked 5 times and then the game will proceed to game mode flagging the error. When an error is flagged the score display will say 2000 and light the led around the ball cup to indicate to the operator that and error was detected.