Why Your Sprinkler Zone Is Not Working and What to Do Next
Get your sprinkler system back to full strength
If one sprinkler zone is not working, you might have an electrical issue with the entire system.
Other potential problems include damaged valves and leaky pipes.
Sprinkler system zones operate independently and may have different watering needs.
Contact a sprinkler repair professional to identify and fix the problem.
If your sprinkler zone isn’t working properly, you should hire a sprinkler repair technician to resolve the issue right away. A faulty controller, damaged or dirty zone valve, defective solenoid, or a leaky pipe could be the cause of the sprinkler zone issue. Let’s review some of the most common causes of this sprinkler system problem.
1. Faulty Controller
Sprinkler controllers (also known as irrigation controllers) are the command center of your sprinkler system, turning water on and off in each zone based on the settings you’ve created. The controller connects to each zone through a dedicated wire, so if there’s an issue with a particular zone’s wire, water might stop flowing to that area.
How to Fix It
Unfortunately, wiring issues can be tricky to identify without professional help. However, there are a few simple solutions to try before you contact a pro. Sometimes, fixing a controller issue is as simple as making sure the device is on, replacing the batteries, or confirming that the watering settings are correct. If none of that works, call a sprinkler expert to take a look. They may need to repair the wiring or replace the controller entirely, which can cost up to $325.
2. Damaged or Dirty Zone Valve
Each sprinkler zone has a sprinkler valve that controls the distribution of water to the sprinkler heads in that zone. If one particular sprinkler zone won’t turn off, it might be because the valve is damaged or filled with debris, forcing it to stay open. Wet valve boxes are another potential sign of a faulty valve.
How to Fix It
Replacing a broken sprinkler valve isn’t a beginner-friendly DIY project. You’ll need to shut off the water supply and disconnect the wiring before removing the old valve and swapping it out for an exact replacement. You might also have to cut and seal PVC pipes. For these reasons, we recommend bringing in a local sprinkler repair pro for this job.
3. Defective Solenoid
The solenoid is an electrical device that connects to your sprinkler valve. It receives signals from the controller, which tell the solenoid when to open and close the valve (or, in other words, turn the water on and off in a particular zone).
Over time, a solenoid can become loose, get dirty, or break. If this happens, the damaged solenoid might release too much water into the sprinkler zone (if it keeps the valve open) or none at all (if it shuts the valve).
How to Fix It
Depending on the exact problem, you might only need to clean the solenoid to get it working again. Otherwise, you might need a new one. If you’re comfortable getting your hands dirty, you can replace a damaged solenoid yourself, using our sprinkler maintenance tips as a starting point. However, this task involves shutting off the water supply, disconnecting the power, and taking apart your sprinkler valve, so if you aren’t comfortable with that, it’s better to hire a sprinkler expert.
4. Leaky Pipe
If the sprinkler zone still turns on but is slower or weaker than the rest of your sprinkler system, you could have a leaky pipe in that zone. In situations like these, water will leak out of your underground pipes before it even gets to your sprinkler heads—which can result in reduced water pressure and water pooling in certain parts of your lawn.
How to Fix It
Fixing a leaky pipe requires specialized skills, so it’s best left to the pros. For this job, a qualified plumber will start by finding the leak, digging into the ground to access the line, and repairing the sprinkler pipe. On average, plumbers charge $50 to $100 per hour for this type of work. Your total sprinkler pipe repair cost will depend on a few factors, including the pipe’s location and the extent of the damage.
When to Call a Pro
When one (or more) of your sprinkler zones isn’t working, there are a few simple things you can try before calling a pro. For example, you can make sure the controller is on and programmed to the correct settings. If you’re up for more of a challenge, you could even try replacing a sprinkler valve or solenoid on your own.
However, if those DIY fixes don’t work, you’re unable to attempt them, or you don’t want to try DIYing it, bring in a pro. In many cases, repairing a sprinkler zone issue involves electrical and plumbing work. If you don’t know what you’re doing, there’s a risk of electrical shock, flooding, and other damage to your sprinkler system.
Most modern sprinkler systems separate your lawn into distinct zones, each with its own sprinkler valve and multiple sprinkler heads. All of the zones run through the same controller.
Zoned irrigation systems distribute the correct amount of water to various parts of your lawn based on their sizes and watering needs. For example, a large grassy zone in the sun will have different watering requirements than a shrubby area in the shade.
There are several reasons why one of your sprinkler zones is not working, but it’s often the result of an electrical problem, such as a faulty controller or bad solenoid. Otherwise, a sprinkler zone might quit working if the valve in that zone is damaged or blocked with debris. Leaky pipes can also make sprinkler zones work less effectively, reducing water pressure and leading to soggy patches in your yard.
If a solenoid valve goes bad, you might notice an excessive amount of water coming out of one of your sprinkler zones. This could indicate that the solenoid is forcing the sprinkler valve open so the flow of water doesn’t stop. Alternatively, a bad solenoid could close the valve, so the sprinklers in that zone don’t release any water.
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