One Sprinkler Zone Not Working
If one irrigation zone fails while others work, the problem is often localized to the controller, valve, wiring, or zone piping.
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Before you startUse only the checks you can perform safely. Disconnect power before homeowner-serviceable cleaning or inspection. Stop when a repair involves gas, exposed wiring, high voltage, a roof, structural components, or anything outside your experience.
Common signs
- One zone never turns on
- Valve hums but sprinklers stay dry
- Zone has very low pressure
Most likely causes
1. Controller programming
The zone may be disabled or scheduled incorrectly.
2. Valve solenoid issue
The electric valve may not open.
3. Wiring problem
A damaged low-voltage wire can stop the valve from receiving power.
4. Leak or blockage
Broken piping or clogged heads can reduce pressure.
Safe checks to try first
- Run the zone manually from the controller.
- Check whether other zones work normally.
- Inspect sprinkler heads for obvious damage or missing caps.
- Look for unusually wet spots that may indicate a buried leak.
When to call a professional
Call an irrigation technician for valve-box electrical testing, buried wiring faults, or underground pipe repair.
Bottom line
Start with the simplest visible cause, change one thing at a time, and avoid repeated resets or disassembly when a safety device keeps tripping. A recurring problem usually deserves a proper diagnosis rather than a temporary workaround.