Is your program enabled?
Have you enabled Weather Adjustment for your program? If so, turn it off. Did the next scedule work? If so, either your location setting needs checking or the weather algorithm decided that you don’t need to water.
What does the Weather Diagnostic say? This can be found in the menu on the left.
Click the floating menu icon in the lower right and select view logs. Change the log view to Table. Do you see an entry for the date that did not water? If so, how long does it say the zones watered?
Check Preview Programs from the floating menu. Does it look right?
Is there a red bar accross the bottom of the screen that says rain detected? If so, do you have a rain sensor connected? If not, do you have the Use Rain Sensor box checked in the weather control section of Options?