Dee Dee Dee! I have an automatic drip sprinkler system that was installed in our home 6 years ago when we bought it new (it was a model).
Never any problem till about a week ago . . . timer doesn't work. Will turn on manually but I don't want to remember to turn each valve on for 20 minutes, one after the other, twice a day. And in hundred and 'teens' temperatures, even native plants will not survive.
So why am I a DEE? Because, while looking for a new system, thinking it needed replacing, I stumbled on the company's tech support number.
A very nice lady showed me how to open the unit and CHANGE THE BATTERY.
Yep, even a hardwired in system may have a 9V battery.
Anyway, all's well that ends well and while you're at it, you might want to pick up a few more 9Vs for your smoke detectors . . .