Whatever else you do, contact Neptune. It could be all of the things others have described, or it could be something else. Neptune can help diagnose the issue and provide the support you need including forcing reinstallation of firmware, checking sensor registers that might indicate other problems.
I had wacky and terribly frustrating issues with sensors disappearing, FMM modules going offline or disappearing, etc, and this behavior resulted in programming not defaulting to the correct state when this happened. It caused a flood that I was able to catch as it happened.
The issue? It turns out the leak sensors are sensitive to interference (any of the sensors with long cables can be prone to this). Even stranger, it seemed to be worse when connected to port 3 of any FMM. The sensors and FMMs went from working just fine for a month to causing issues over a few weeks as my installation grew incrementally.
The solution? Ferrite cores on the ends near the plugs of the sensors. Haven't had an issue since.
I had wacky and terribly frustrating issues with sensors disappearing, FMM modules going offline or disappearing, etc, and this behavior resulted in programming not defaulting to the correct state when this happened. It caused a flood that I was able to catch as it happened.
The issue? It turns out the leak sensors are sensitive to interference (any of the sensors with long cables can be prone to this). Even stranger, it seemed to be worse when connected to port 3 of any FMM. The sensors and FMMs went from working just fine for a month to causing issues over a few weeks as my installation grew incrementally.
The solution? Ferrite cores on the ends near the plugs of the sensors. Haven't had an issue since.