We have had quite a few calls lately regarding sprinklers not working. The clock looks like it is running just fine, but no water is coming out.
98% of the time this situation means it is your sensor! Especially, this time of year, we have a wide range of weather.
One day it rains all day, the next night it gets down to 32 degrees. Both of these situations will trigger the sensor.
When the sensor is triggered it stops the system from watering. But it does not stop the clock from looking like it is working.
When the temperature turns off your system, it will come back on the next day as usual, as long as the temperature is back up above 35.
When rain turns off your system, it will be off a few days. Usually a good rain will keep it off 3 days and then it will go back to its normal watering schedule.
Now, this does not mean you cannot use your system in these situations. You can bypass your sensor and it will work as normal. Most controllers will have a bypass sensor switch, but if you do use that remember to set it back, the sensor does these things for reasons and we do not want broken equipment due to freezing!