There are a few potential causes for this issue:
-The controller may not be compatible with the scoreboard. Ensure that the controller is properlly powered on and in range of the scoreboard.
-One or more of the game pieces may be defective. Check to see if any game pieces are missing or broken. If so, replace them as necessary.
-The batteries might need to be replaced. AA batteries are located inside the controller box and should be checked regularly for freshness.