Thanks Ray – meanwhile watering season in Germany is over, so I’ll wait and see if the issue shows again next year. I have meanwhile exchange the DC power supply to a more performant one, as mine was at the lower end of the spec.
I have this exact problem. I am guessing the power surge between closing one zone and opening another – at the same exact time – maybe causes the microcontroller to lock up. This has happened to me twice now in 2 weeks. I will change the program to include a few seconds between open / closes to see if that fixes it. Is the 7.5v power supply not enough to control the valves and run the os 3.0?
I doubt if this is a power adapter issue, but you can try another adapter to see if it makes any difference — any DC adapter that outputs 7.5VDC to 12VDC is fine. I would recommend a minimum of 1 amp output current.