We are currently experiencing data problems for the London Underground. This is an issue from TFL, who are working on solving the problem. As soon as they have resolved this issue our boards should return to normal. You can read more about this here.
*Upcoming arrivals in the next 5 minutes. At certain times there may be minimal or no scheduled arrivals. Some lines don't run at night, off peak, or during engineering work. Shorter routes with less frequent trips may be running, but may not have any arrivals in the immediate future.
If there are no arrivals showing when there should be, then there may be an issue with data coming from the transit network.