I have a Hunter system as well. I thunk every house here in TV has a Hunter system. I came back to my villa after a couple of months and noticed that the system was turned off and the shrubs looked very thursty
Tried to turn it back on and what I did was to program another sequence for watering. Now I was watering twice as much and went over the water usage and got charged extra for it.
What I did was to Google the specific Hunter model to get an operations manual. I fornd the Master Reset Button and deleted all the programming and then started from scratch programming the day, time, etc. etc. (Very easy to re-program)
Works perfectly ever since.
Hope my idea helps you out!!