OpenSprinkler › Forums › Hardware Questions › OpenSprinkler Pi (OSPi) › Valves Won't Turn Off › Reply To: Valves Won't Turn Off April 23, 2018 at 4:11 pm #49668 RayKeymaster Are you sure you are using 24V AC transformer? The typical cause for valves not able to shut off is that the power adapter is a DC adapter. If you are not sure, you can look at the transformer’s label to see if the output voltage is AC or DC.
