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Try and do a power reset to the dishwasher. This means turn the mains power off to the dishwasher and back on again. If there is no mains socket under the kitchen bench then maybe do this from the mains contactor switch in the meter box. If there is no difference to the behaviour of the top drawer then the controller has most likely packed up. You can test things out by taking controller from bottom drawer and putting in top drawer. But this requires some experience with taking out the front covers of the drawers, taking out the connectors and putting back. If you mix the connector connections etc you can cause more damage. Take photos as you go along. Make sure the dishwasher is disconnected from mains power when you are working on it.
The most logical explanation is the controller in top drawer has packed up or the power board located at the base of dishwasher housing (under bottom drawer) has partially packed up and stopped supplying power to the top drawer controller. But another explanation is that the thermal relay in the top drawer (located inside the heater element assembly has cut off. This stops power to the controller. This is the most expensive to fix as the entire heater element assembly has to be replaced as the thermal relay is not separately accessible. How you want to isolate the problem and fix it depends on how comfortable you are with fixing electrical and electronic systems. This is a very sofisticated dishwasher and a small mistake is irreversible. By the way you can open the drawer by forcing it open but keep in mind not to try to shut it firmly again until you restore the controller power. Otherwise the lid seal or actuator motors will be damaged. Whatever you do, make sure the mains power is turned off if you work on the dishwasher circuits.
There could be several reasons for the beeping. The dishwasher checks for sensor to make sure it is in good health before it starts. Most likely the drawer close sensor is detecting fault. This is to ensure the drawer is closed fully to avoid water leaks when dishwasher is on. Sometimes sensor itself has failed and has nothing to do with position of drawer. Open top cover carefully to make sure the drawer is travelling ok on the rails. TAKE MAINS POWER CABLE OUT BEFORE WORKING ON DISHWASHER.
Are you saying the lights are blank and when you press the start buttion nothing happens?
One reason the controller can shut the power is that the heater overload protection thermal resistor has opened. Unfortunately the only way to fix this is to replace the entire heater plate at the bottom of the drawer.
To confirm if the controller is operational or not, press Keylock and Start/ Pause button together for 5 sec (press Keylock first) and see if the Lights light up. If nothing happens then either the power has shutoff as mentioned above or controller is faulty.
Depending on your familiarity with such equipment you could try to replace and fix. I am not quite sure what the new model you mention is. I believe all DD603 models have power to the 2 drawers coming from the base board.
The error was a flood fault, water was not draining from either of the drawere, I removed the bottom drawer, dried drip pan and used hairdryer to dry fault sensor, the dishwasher then reset itself and works fine.