Quick answer: A rain sensor temporarily interrupts or suspends scheduled irrigation after sufficient rainfall. It helps prevent unnecessary watering, but it does not measure soil moisture throughout the landscape or repair an inefficient watering schedule.
What the sensor does
Most residential rain sensors communicate with the irrigation controller and prevent automatic watering when the sensor has been activated by rainfall.
Why a system may not run after rain
If the controller appears normal but watering is being skipped, check whether a rain sensor or weather delay is active before assuming a valve or wiring failure.
Common sensor problems
- Sensor remains wet or obstructed
- Wiring is damaged
- Sensor bypass setting is misunderstood
- Old sensor no longer responds consistently
If the controller has power but nothing runs, see our controller troubleshooting guide.
