My first inclination would be a problem with the magnetic lock-out for the door and jamb see that it is still there on both ends, is unobstructed and makes a good connection. Dryers don't run with the door open.
Next thought is an electrical connection in the UI system is broken. Final thought would be a problem with the drying mechanism itself.
Next thought is an electrical connection in the UI system is broken. Final thought would be a problem with the drying mechanism itself.