I eagerly purchased an installed a Orbit 57946 B-hyve. Replacing an old rainbird. I have 5 zones, and wiring was setup like for like.
I tested w multimeter and no indication on any common + zones. The 24v out works, and is the only thing i can measure. I do hear an audible hum from the transformer too.
Wiring photo of rainbird:
Wiring photo of Bhyve:
Coincidentally had support just call me (on hold now). I suspect transformer hum is issue? Here is a video w sound.
Edit: Support was very quick and is processing a replacement for me. I will try to open the transformer and check for loose wires, but the hum concerned them too.