I just installed a new 16 zone Rachio sprinkler box. Followed all the directions, snapped the front panel on, plugged it in and no power. When I pulled the cover off while still plugged in, the power came on. Snapped it back in place, no power again.
@mtatz, thanks for reaching out.
This sounds like a wiring issue. Could you post (or send to email@example.com) a few photos of your wiring to review? Please include any before photos of the wiring on the old controller if you have them as well so we can cross reference.
Someone from Rachio called me back. It was my rain sensor wiring. All is well with that now.