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If the display is flashing like this on and off then the first thing to try if you haven't already is try it in another outlet socket and see what happens.
But if still the same then you need to unplug the appliance and remove the outer door panel and there you will see the control units. Check the wiring on there and see if theres signs of burning or loose connections.
But if the wiring is good then im afraid its looking like the control board will be the fault as it sounds like the relay is clicking on and off in there, In this case the control board will need to be replaced and that should sort it from there.