I have the same issue…
The solenoids are heating very quickly and i had to disconnect the wiring to stop it.
If im letting the rachio control - the watering does not stop.
Checked everything 10 times at least.
The valves are new.
But they arrived with dc solenoids and i replaced them with brand new ac solenoids.
The system is with master valve.
And 3 zones right now.
Can any1 help me out?
Im not the retiring person and with technical knowledge but this time they breaking me here…
Am I correct that you spliced the barrel plug power connection (yellow and green tape)? If you have an incorrect power brick, it can cause this. It almost sounds like you have a DC power brick, and you need AC. Can you post a picture of your power supply?
The more, the better (as far as amps). Look for a ~ mark to know that the supply is AC; what looks like equal sign ( ⎓ ) is a DC indicator. @tmcgahey is exactly right, DC supplies allow rachio to operate and turn on the valve, but they are then stuck in the ON state as rachio’s control circuit is not designed for it (and running AC solenoids on DC power will cause them to heat more and fail sooner).
