2 flashing lights?

Hello there, I was wondering if someone might be able to help. I've got a Diplomat ADP 8242 Dishwasher, but it's stopped working. Once you've selected a programme and closed the door, you can hear the pump working - though there's no longer any water left to pump out, but then the cycle stops and the machine just beeps. Inside, the 2 lights by the programme selector button are flashing. Does anyone know what might be wrong, or at least how to reset this machine? I would appreciate it.