How long was it out? There could be dried water inside the lines...try priming the sample line a bunch and/or remove the sample ine and make sure it is clear. Both of those are easy...try them and if they don't work, we can move on to harder things.The sample line on my Neptune trident fell out of the tank. I got an error message saying no water. I tried putting it back in and priming the line but no luck. The trident keeps going through some sort of process and never gets set again. Any thoughts?