Sprinkler Troubleshooting by Symptom

Start with what the system is doing, not with a guess about the failed part. These paths help U.S. homeowners narrow the problem before repairing or replacing equipment.

Zone will not turn offA zone keeps watering after the controller cycle ends.Low pressureWeak spray, heads not rising, or one zone underperforming.Zone will not startSeparate controller output, wiring, solenoid, valve, and supply causes.Leaks and pooling waterNarrow wet valve boxes, leaking heads, line leaks, and drainage symptoms.Controller problemsSchedules, power, zone output, sensors, common wire, and connectivity.Uneven wateringCoverage, nozzle, pressure, head spacing, and mixed precipitation problems.Drip irrigation problemsLow flow, clogged emitters, filters, regulators, tubing, and leaks.Not sure where to start?Use the interactive diagnostic path to narrow likely causes.

Symptom-first diagnosis

How to troubleshoot a sprinkler system without guessing at parts

A useful diagnosis starts with the behavior you can actually observe. Whether a zone will not start, will not stop, sprays weakly, leaks, or waters unevenly tells you which part of the system to isolate first. Replacing a controller, valve, solenoid, head, or nozzle before the symptom is narrowed can add cost without fixing the cause.

If a zone keeps running

First separate a control problem from a water-control problem. Confirm whether the controller is still commanding the zone. If the scheduled cycle has ended but water continues, use the zone will not turn off guide and the valve troubleshooting hub to check manual controls, debris, sealing, and the relationship between the controller signal and valve behavior. Do not assume the controller failed just because water is still moving.

If a zone will not start

Work from the controller toward the field. Verify the schedule or manual command, then narrow whether the issue is controller output, wiring, the solenoid and valve, water supply, or the affected zone itself. The controller hub is the best starting point when the display, power, schedule, sensor, or zone output is part of the symptom.

If pressure or coverage is weak

Scope matters. One weak head points to a local restriction, nozzle, head, or nearby fitting before it points to the entire water supply. A whole weak zone deserves a broader pressure and flow check that includes restrictions, leaks, valve opening, demand, and supply conditions. Start with the pressure and flow hub, then move to sprinkler heads and nozzles if the symptom is local.

If you see leaks, pooling, or water where it should not be

Pinpoint where the water appears and whether the system is running at the time. A wet valve box, water around one head, a constantly damp low spot, and a drip-line fitting leak are different diagnostic paths. Use the valve hub, sprinkler head hub, or drip irrigation hub based on the location instead of replacing the nearest visible part.

If the problem looks intermittent

Intermittent symptoms are easier to diagnose when you record what the controller shows, which zones are affected, whether the issue changes between automatic and manual operation, and whether the problem appears after a schedule or sensor event. That evidence helps separate controller behavior from wiring, valve, pressure, and coverage issues.

Not sure which path fits?

Use the interactive sprinkler diagnostic tool. It asks four observable questions and routes you to the most relevant troubleshooting hub without declaring a failed part from a single symptom.

Controller and wiringPower, schedules, sensors, outputs, and common-wire symptoms.Valves and solenoidsZones that stick on, fail to open, seep, or behave inconsistently.Pressure and flowWeak zones, broad low flow, restrictions, leaks, and supply clues.Brand-specific helpUse after the generic symptom is clear and model behavior changes the answer.

Sprinkler Solved organizes guides by the symptom and component that matter to diagnosis. Technical claims are reviewed against current manufacturer or authoritative sources before autonomous articles can publish.

Latest published guides

Recently published troubleshooting

Sprinkler System Troubleshooting: Symptom-First Checks for Zones, Valves and HeadsTroubleshoot by symptom before opening parts: check water supply and rain sensors, isolate single-zone failures, safely inspect valves, and distinguish normal low-head drainage from leaks.Sprinkler Zone Won’t Turn Off: Causes and FixesFind out why a sprinkler zone keeps running, how to isolate the controller or valve, and safely inspect common valve problems.Sprinkler System Losing Pressure: Zone-First Diagnosis GuideDiagnose weak sprinkler pressure fast: learn to tell whole-home supply issues from one weak zone and which valve, leak, and nozzle checks to do first.Sprinkler Valve Won't Open: Diagnosis and FixesSprinkler valve won't open? Check flow control, controller voltage, solenoid function, bleed ports, diaphragm condition, and flow direction with brand-specific diagnostic steps.Sprinkler Heads Not Popping Up: Causes and ChecksTroubleshoot sprinkler heads that stay down by separating a single clogged or damaged head from low pressure affecting the entire irrigation zone.Sprinkler Zone Not Working: How to Diagnose ItLearn how to diagnose a sprinkler zone that will not run by separating water-supply, controller, wiring, solenoid, valve, and pressure-related faults.