The 3 most common part(s) or condition(s) which cause the symptom Dishwasher lights flashing or blinking are listed below starting with the most likely. Check or test each item and watch any available videos.
RepairClinic Item # 1557808
If lights are flashing on the control panel, the heating element might have burned out. The heating element heats the water up to operating temperature. After a set amount of time if the temperature isn't reached a light on the control panel might start flashing. The heating element can be checked for continuity with an Ohm meter.
If the display lights are flashing and there is an error code in the display window, check the wiring diagram and tech sheet in the dishwasher that will provide information on the fault.
RepairClinic Item # 2813258
If lights are flashing on the control panel, the drain pump might not be working properly. For two-wire drain pump motors check them for continuity using an Ohm meter. If it's defective You'll need to replace it. Drain pumps are not repairable.