Can't control one zone

I’m having trouble getting my zone 1 to work at all. One thing I’ve noticed is when I use the “Quick Run” with zone 2, the program comes up for that zone and stays there on the screen and you can press stop or watch the time ticking by etc. When I do the same for Zone 1, it comes up and the time ticks away for a couple of seconds, but then that screen disappears and the water doesn’t start. Is that like a tell-tale error that anyone would recognize?

I have the first generation and bought it a couple of years back, but just hooked it up around Christmas. It worked when I first set it up, but I guess it hasn’t been running since.