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So yes, not enough water will definitely cause your problem. The 7 flashes means that the dishwasher isn't heating the water. If you don't have enough water to spray around, it won't heat. Look at the water level and make sure it covers the entire floor from wall to wall (it will be a thin layer of water not deep but it should touch the side walls). If you don't have enough water to cover the floor then replace your electronic water valve because it's restricting the water flow. Below is a link to the part you'll need to order and replace for your model.
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Put 4 cups on the top rack (1 in each corner) facing upwards. Do the cups fill up with water if you run it for 5-10 minutes?
OK then you need to test the high limit thermostat below the tub and see if there is continuity through it. This is the dime sized black and silver device that one of the wires from the heating element connects to. If it doesn't have continuity replace it. If it does have continuity, you're down to either a bad control board or an issue with the door latch. Open the door and pull the door striker down and bend it just enough so that it barely slides over the inner door liner when the door opens and closes. That will make sure the switch is totally depressed and not just partially depressed on the latch. If that checks good and you still get the error code, you need to replace your control board.
Hello again. I'm just following up because I haven't heard back from you and I see this question is still open. Is there anything else I can help you with?