Sprinkler System Troubleshooting | Elite Sprinkler
Few things are more frustrating than walking outside to find your sprinkler system is not working when your lawn desperately needs water. The good news is that most irrigation problems have straightforward causes. Before you call for a service visit, this sprinkler system troubleshooting guide walks you through the most common issues we see at Elite Sprinkler Systems and what you can check yourself.
System Won't Turn On at All
If your sprinkler system won't turn on and nothing happens when you run a program or activate a zone manually, start with the basics. Check that the controller is plugged in and has power — look for a lit display screen. If the display is blank, check the outlet, the circuit breaker, and the controller transformer. Next, check whether your rain sensor is overriding the system. Many rain sensors have a small switch or bypass feature on the controller. In Michigan, rain sensors can remain activated for days after heavy rainfall, which is exactly what they are designed to do, but homeowners often mistake this for a system failure. Finally, check the common wire (C wire) connection at the controller terminal strip. The common wire completes the electrical circuit to every valve, and a single loose connection here will prevent every zone from running.
One Zone Won't Turn On
When most zones work fine but one specific zone refuses to turn on, the problem is isolated to that zone circuit. The most likely causes are a bad solenoid on that zone valve, a cut or damaged wire between the controller and that valve, a valve that is mechanically stuck closed, or a faulty terminal on the controller. Try activating the zone manually at the valve itself by turning the solenoid a quarter-turn counterclockwise. If the zone runs when you open it manually, the problem is electrical — either the solenoid, the wiring, or the controller terminal. If it does not run even when manually opened, the valve is mechanically stuck and needs to be disassembled and cleaned or replaced.
No Water Coming Out of Any Zone
If the controller appears to be running but no water comes out of any zone, the issue is upstream of your valves. Check the main irrigation shut-off valve — it must be fully open. Check the backflow preventer; both test cocks should be closed and both shut-off handles should be fully open and parallel to the pipe. If your system has a master valve (a valve that controls water flow to all zone valves), it may have failed. Master valve failure cuts water to the entire system even though the controller and zone valves are functioning normally. Also confirm that your municipal water supply is active — if a neighbor is also experiencing low or no water, the issue is with the water main, not your irrigation system.
Sprinkler System Not Working in All Zones
When your sprinkler system is not working in all zones — meaning every single zone fails — the problem is almost always something shared by all zones rather than individual zone components. The common wire is the most frequent culprit. Every zone valve shares a single common wire back to the controller. If that wire is damaged, corroded at a splice, or loose at the controller terminal, no zone can complete its circuit. Lightning strikes and power surges can also fry the controller triac (the component that sends voltage to each zone), killing all zone outputs simultaneously. A multimeter test at the controller terminals will reveal whether voltage is reaching the field wires.
Heads Not Popping Up Fully
Sprinkler heads that barely emerge from the ground or pop up weakly usually indicate a pressure problem. The most common cause is too many heads on a single zone, which divides the available water pressure among more outlets than the system was designed to supply. Underground leaks on that zone also reduce pressure at the heads. Individual heads may fail to pop up due to debris packed around the stem, a worn internal spring, or dirt inside the head body. Pull the head up by hand and check whether the stem moves freely. If it is gritty or stiff, the head needs cleaning or replacement.
System Runs But Lawn Is Still Dry
If your sprinkler system runs its full cycle but your lawn still has dry patches, the problem is coverage rather than water supply. Walk each zone while it runs and look for misaligned heads spraying onto sidewalks or driveways instead of turf, clogged nozzles producing weak or erratic streams, coverage gaps where head-to-head spacing is too wide, and run times that are too short for your soil type. Michigan clay soil absorbs water slowly. If your run times are only 10 minutes per zone, you may not be applying enough water to reach the root zone. A catch cup test helps determine exactly how many minutes each zone needs to deliver 1 inch of water.
When to Call a Professional
Some irrigation problems require professional equipment and expertise. Call a professional when you suspect electrical issues such as a fried controller or damaged field wiring, when you have an underground leak that you cannot locate or access, when backflow preventer problems require testing or replacement, when multiple zones fail simultaneously after a storm or power surge, or when you have worked through the basic troubleshooting steps above and the problem persists. Why is my irrigation system not working is a question with many possible answers, and a trained technician can systematically test each component to find the root cause quickly.
Professional Sprinkler Troubleshooting in Metro Detroit
Elite Sprinkler Systems provides expert sprinkler system troubleshooting and repair throughout Metro Detroit. Our technicians carry diagnostic tools, replacement parts, and the experience to solve even the most stubborn irrigation problems. We serve Ferndale, Royal Oak, Birmingham, Troy, Sterling Heights, Shelby Township, Rochester, Novi, and all surrounding communities in Oakland and Macomb counties. Call (586) 498-6112 to schedule a diagnostic visit or request a quote online.