There’s little more disappointing than stepping outside expecting to see a lush green lawn—only to be met with dry, brown patches and wilted plants. Like many, you’ve likely set your sprinkler system on a timer, trusted it to do its job, and assumed your lawn was getting the care it needed. So when things look parched instead of hydrated, it’s more than frustrating—it’s a sign something’s wrong.
Whether it’s a minor hiccup or a bigger issue, understanding the cause of sprinkler system failure can save you time, money, and the hassle of trying to revive a thirsty lawn. Before you start digging up your lawn or calling in the pros, here are some common reasons your sprinkler system isn’t turning on, and steps you can take to get things flowing again.
Clogged Spray Heads
Over time, dirt, debris and minerals can build up in your sprinkler system’s spray heads. This buildup can block water flow and reduce pressure, leading to uneven coverage across your lawn and garden. The result? Dry spots and thirsty plants.
These clogs also put a strain on your overall sprinkler system, increasing the risk of breakdowns and failures. If your sprinkler system isn’t turning on or running properly, have it inspected and cleaned to keep your yard looking its best.
Broken Sprinkler Heads
If you notice your sprinkler system isn’t turning on, the first step is to check your sprinkler heads for signs of damage. Over winter, your sprinkler heads can become clogged, misaligned, or even damaged, causing them to malfunction. Cleaning or replacing damaged or broken sprinkler heads should resolve the issue.
Control Valve Box Issues
Your system’s control box directs irrigation to different areas of your yard. Problems with the control valve box can result in either no water flow, or an overabundance of flow. Regular inspections are crucial to maintaining your control and zone valves, and keeping your system running.
Leaking Pipes
Commonly missed, until it’s too late, underground leaks can reduce pressure, causing your sprinkler system to malfunction. Watch for signs of leaks, including marshy patches in your yard. Leaks can cause significant damage and potential failure, and should be addressed by a professional immediately.
Power Outage
If your sprinkler system relies on electricity, one reason it isn’t turning on could be a power outage. Even if the lights are back on, your sprinkler system may need a reset or a manual start-up. After getting it back in working order, make sure the timer is functioning correctly.
Electrical Failures
Electrical issues are a common cause of sprinkler system failures. Issues such as low voltage or damaged wiring to the valves, master valve, or solenoids can impede their operation and prevent the system from turning on. Similarly, compromised or loose connections within the valve box can be responsible for all zones failing to activate.
Faulty Backflow Device
Your backflow device prevents contaminated water from reentering the water supply. If it’s malfunctioning, it can disrupt your flow. To determine if your backflow device is working properly, schedule an inspection to detect and resolve any issues.
Controller or Timer Malfunctions
The brain behind the operation—your controller—ensures everything is running as it should. The most frequent problems encountered are programming errors or power outages. Confirm that the timer is accurately set and receiving power, as schedule alterations or cancellations can occur after a clock reset.
If power and timer settings are correct, inspect the controller’s electronics for faults. Activation can be hindered by faulty wiring, internal damage, or missed error messages.
Incorrect Zone Settings
If your controller isn’t programmed correctly for your zones, your system may be spending more time watering the sidewalk than your thirsty lawn. First, confirm that your zone settings are accurate and that the system is watering the designated areas. If these settings are correct, the problem might be with your sensors. Excessive moisture, such as rain, can cause the system to malfunction if it incorrectly detects adequate moisture levels, preventing it from activating.
Water Supply Issues
One common, but often overlooked, reason a sprinkler system isn’t turning on could be the water supply itself. Start by checking the main water shut-off valve to ensure it’s open. Even if it’s slightly closed, it could be restricting the water supply.
Unusual System Noises
Unusual noises coming from your sprinkler system can indicate an issue. If you detect a hissing, whistling, or banging sound, you may suggest deeper issues, including air in the pipes, leaking, or a pressure buildup in the system. Have it checked by a professional to avoid major repairs.
Sprinkler System Isn’t Turning On? Call the Experts
Whether you’re having issues turning your sprinkler system on, looking for an inspection or maintenance, or ready to have a new system installed, the pros at Naiad Irrigation Systems have you covered. For over 20 years, we’ve been committed to providing high-quality, long-lasting sprinkler systems. If your sprinkler system isn’t turning on, we’ve got the expertise to fix it.
Contact Naiad Irrigation Systems for more information or to book an appointment.
Book a service or call us today @ 587-200-3994. We provide top-notch services from Irrigation Association-certified professionals.
