Quick answer: A sprinkler controller that waters more than once in a day often has multiple start times programmed, overlapping programs, cycle-and-soak settings, or a schedule that is being misunderstood. It does not necessarily mean the controller is defective.
Multiple start times are a common cause
On many controllers, each start time launches an entire program rather than a single zone. Accidentally entering several start times can repeat the full watering sequence.
More than one program may be active
Separate programs can contain overlapping watering days or zones. Review all active programs rather than checking only the one shown first.
Cycle-and-soak can be intentional
Some systems divide watering into shorter cycles to reduce runoff. Several shorter runs may therefore be intentional when separated by soak periods.
When troubleshooting is needed
If the displayed schedule does not explain the repeated operation, controller configuration, wiring or valve behavior may need diagnosis.
See why controllers skip scheduled watering and our smart controller service.
