We have a 12 station F5F866 sprinkler system which has been working fine, but after returning home from a 2 mo vacation we discovered it did not water at all from Aug 14 to now. I can’t see anything wrong with the setup and the history doesn’t show any disabling events. I suppose it appears as if the active watering schedule is disabled or perhaps standby mode. I’m wondering how to find out what went wrong. I’ll know more tomorrow is it runs on schedule.