The moonlight would not likely be the cause unless it was somehow aimed at a reflector that could reflect it directly onto the photocell and the photocell generally needs more light that this. The one thought I had was that if you use LED lighting, LED lighting can be so focused that it is not hitting the photocell in a way that it can work, you are at a threshold between being on and off because the light is just barely glancing the actual photocell. It would then need to be further away in distance (height) for the light to spread, or moved slightly. But if this happens in complete darkness we can rule that out. Is the 7097.050 connected to just one pump or are two pumps networked? This is a new product so I don't have much experience with it, we will get it solved for you, but I will need to contact the factory and see what they have to say.
