OpenSprinkler › Forums › Hardware Questions › OpenSprinkler Pi (OSPi) › Valves Won't Turn Off › Reply To: Valves Won't Turn Off April 26, 2018 at 4:22 am #49696 vikParticipant Mike / Ray Thanks for the assistance – yes it appears switched mode power supplies output DC and that was the problem. I just connected up the power supply from RS and everything is working fine! Vik
