I had the same error and the tank was not even full. I took the cover off of the unit which consisted of removing 10 screws. The water tank is on the bottom left side. I then removed the float which was a small sensor with a styrofoam float. I removed the float (2 more screws) and moved it up and down. It did not appear to move very smooth but after moving it back and forth a few time it seemed better. I put the float back in ensuring it was at the low point, screwed it back in and then tested the unit. It came on and appears to work fine now. I unplugged again putt the cover back on it has now ran 30 minutes no problems.
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