Why Is My Sprinkler System Not Turning On?

What you'll learn:

• How to narrow the problem from "nothing works" to a specific component
• How to test your controller output with a basic multimeter
• The voltage and resistance readings that tell you exactly what's broken
• DFW-specific problems caused by clay soil, storms, and hard water
• Which problems you can fix yourself vs. which need professional tools

Experience level: Intermediate (basic multimeter use helpful but not required)

Step 1: Is It One Zone or the Entire System?

Before you grab tools, figure out the scope of the problem.

Try running each zone manually from the controller. Most controllers have a manual start or test function. Run through every zone for 2-3 minutes each.

This single test narrows your troubleshooting from "everything is broken" to a specific area. That saves time and money whether you're fixing it yourself or calling someone.

• No zones work at all — The problem is upstream: water supply, master valve, or controller.
• One zone won't turn on — The problem is zone-specific: that zone's valve, solenoid, or field wire.
• Some zones work, some don't — Could be multiple solenoid failures, a partially broken common wire, or wiring damage affecting certain runs.

Step 2: Check the Water Supply

This sounds obvious. It isn't. About one out of every five "my system won't turn on" calls we get is a closed shutoff valve.

Where to Look

Your irrigation system has at least one shutoff point, usually at the backflow preventer (also called a double check valve assembly). It's typically a brass or copper assembly near your water meter or on the side of the house, often with two ball valve handles.

Both handles should be parallel to the pipe (inline with the water flow). If either handle is perpendicular — turned 90 degrees — the water is shut off.

Why It Gets Shut Off

• A plumber turned it off during other work and forgot to reopen it
• You (or a previous homeowner) shut it off for winter and never turned it back on
• Someone bumped the handle
• City water work required a temporary shutoff

The fix: Turn both handles so they're parallel to the pipe. Then try running a zone. If water flows, you're done.

Step 3: Test the Master Valve

Many irrigation systems have a master valve — a valve that controls water flow to the entire system. It opens when the controller sends a signal, and it closes when the system shuts off. If the master valve isn't opening, no zone gets water.

Manual Bleed Test

Find the master valve. It's usually buried in a valve box near the backflow preventer or near the first zone.

Most irrigation valves have a bleed screw on top of the solenoid (the cylindrical part with wires coming out of it). Turn the bleed screw counter-clockwise about a quarter to a half turn. If the valve is getting water, you'll hear it open and water will start flowing through the system.

Important: When you bleed the master valve open, water fills the mainline but doesn't come out of sprinkler heads. The zone valves are still closed. You'll need to also manually bleed a zone valve to confirm flow — or just listen for the master valve opening and the sound of water charging the line.

Common Master Valve Problems

• Bad solenoid — The electromagnetic coil that opens the valve burns out over time. Solenoids are replaceable without digging up the valve.
• Wiring damage — A cut or corroded wire between the controller and master valve. Landscapers, trenching, and rodents are the usual culprits.
• Stuck diaphragm — Debris or mineral buildup from DFW's hard water prevents the valve from opening. Sometimes a manual bleed-and-close cycle clears it.

Step 4: Check the Controller Output

Your controller might look perfectly normal — screen is on, schedule is programmed, clock is correct — and still not be sending voltage to your valves. The display and the output are two separate circuits. The screen running on backup battery power while wall power is actually off is more common than you'd think.

What You Need

A multimeter (also called a volt-ohm meter). You can get a basic one at any hardware store for $20-30. Set it to AC voltage (the "V~" or "VAC" setting).

How to Test

1. At the controller, find the terminal strip where the field wires connect. You'll see labeled terminals: C (common), M or MV (master valve), and numbered terminals (1, 2, 3, etc.) for each zone.
2. Start a zone manually from the controller.
3. Put one probe on the Common (C) terminal and the other probe on the zone terminal you just activated (e.g., terminal 1).
4. Read the voltage. You should see approximately 24 to 28 volts AC. Most controllers put out around 26 volts.

Also Check the Master Valve Terminal

Put one probe on C and the other on the MV terminal while a zone is running. You should see the same 24-28 VAC. If the master valve terminal shows 0 volts, the master valve won't open — and no zone will get water even if the zone valves are fine.

Controller Looks Dead?

• Check the outlet — plug something else in to verify power
• Check for a blown fuse or tripped breaker
• Check if the controller has a battery backup that's been powering the display while wall power is actually off
• Lightning and power surges are common in DFW storms and can fry controllers even through surge protectors

Step 5: Test the Wiring

You've confirmed the controller is sending 24 VAC. But is that voltage reaching the valve in the ground? Wire problems are one of the most common causes of zones not working, especially in North Texas where clay soil shifts and settles constantly.

Voltage Test at the Valve

This is the real diagnostic step. Go to the valve box in the yard.

1. Set your multimeter to AC voltage.
2. Put the black lead in the dirt — literally push it into the soil near the valve. The earth acts as your ground reference.
3. Touch the red probe to the field wire (the colored wire connected to the solenoid). With the zone running from the controller, you should read approximately 24-26 volts AC.
4. Now touch the red probe to the common wire (usually white). It should read close to 0 volts.

What the Readings Mean

Field Wire	Common Wire	Diagnosis
~24-26 VAC	~0 VAC	Wiring is good. Problem is the solenoid or valve itself.
0 VAC	0 VAC	Field wire is cut or disconnected between controller and valve.
~24-26 VAC	~24-26 VAC	Common wire is broken. Voltage on both wires but circuit can't complete. Valve won't open.
Under 18 VAC	~0 VAC	Partial wire break or high-resistance connection. Wire is damaged but not fully severed.

The broken common wire is one of the trickiest problems because a homeowner testing just the field wire might think everything looks fine. You have to check both wires to catch it.

Resistance (Ohm) Test for Wire Integrity

If you want to test wiring without running a zone, disconnect the field wires at the controller and use the ohm (resistance) setting on your multimeter.

At the controller terminal strip, measure resistance between the common wire and each field wire:

• Common to Master Valve: should read 16-70 ohms
• Common to Zone 1: should read 16-70 ohms
• Common to Zone 2: should read 16-70 ohms
• Common to Zone 3: should read 16-70 ohms
• Continue for each zone...

What the Ohm Readings Mean

• 16-70 ohms — Normal. Solenoid and wiring are intact.
• Infinite / OL (open line) — Broken wire or disconnected solenoid. Signal can't get from the controller to the valve.
• Under 10 ohms — Short circuit. Two wires are touching somewhere underground, or the solenoid has an internal short.
• Higher than 70 ohms — Corroded connection, partially damaged wire, or waterlogged splice. Signal is getting through but weakly.

Test every zone. If most zones read normally and one reads OL, you've found your problem zone.

Step 6: Sprinkler Head Not Popping Up?

Sometimes the system IS running — you can hear water in the pipes — but specific heads won't pop up. This is different from the system not turning on, but homeowners often describe it the same way.

When It's NOT the Head

If you replaced the head and it still won't pop up, the problem is pressure — not the head. Check for:

• A leak elsewhere on the zone (look for soggy spots in the yard)
• A partially open zone valve (diaphragm not opening all the way)
• Too many heads on one zone — common in systems that were expanded over the years without resizing the zones

DFW-Specific Factors

North Texas creates unique challenges for irrigation systems that homeowners in other parts of the country don't deal with.

Clay Soil Movement

DFW sits on expansive black clay that swells when wet and shrinks when dry. This constant movement stresses buried pipes, valve connections, and wire splices. A waterproof splice that was perfect when installed can crack open after a few seasons of the soil expanding and contracting around it.

If you're getting intermittent zone failures — works sometimes, doesn't other times — soil movement damaging a wire splice is one of the most common causes we see across Garland, Plano, Allen, and the rest of the Metroplex.

Storm Damage

DFW thunderstorms regularly produce lightning that can fry controllers, even through surge protectors. If your system stopped working after a storm, the controller is the first suspect. Check for a burnt smell near the transformer or melted/discolored terminals.

Hard Water and Mineral Buildup

North Texas water is hard — high in calcium and magnesium. Over years, mineral deposits build up inside solenoids and valve diaphragms, causing them to stick. If a valve worked fine for years and gradually stopped, mineral buildup is often the reason.

Freeze Damage

While DFW doesn't get the deep freezes that northern states do, we get occasional hard freezes that catch exposed backflow preventers, above-ground pipes, and valve solenoids. If your system stopped working after a freeze event, check the backflow preventer for cracked fittings and each zone valve for freeze-cracked solenoids.

Smart Controllers: Skip the Multimeter

If all this voltage and ohm testing sounds like more than you want to deal with, there's a modern shortcut: smart irrigation controllers with built-in current monitoring.

Traditional controllers are dumb — they send voltage and hope for the best. They have no way of knowing whether the valve actually opened. A smart controller like Rachio closes that feedback loop by measuring current flow on each zone:

• Normal current draw — Zone is working. Solenoid is pulling the expected milliamps.
• Zero current — Wire is cut or solenoid is dead. You get an alarm.
• High current — Short circuit in the wiring. You get an alarm before it damages anything.
• Gradually increasing current — Solenoid coil is degrading. Early warning before it fails completely.

This means a Rachio Pro can detect a bad solenoid or broken wire the same day it happens — not three weeks later when you notice the dead patch. For homeowners who don't want to learn multimeter diagnostics, this is the closest thing to having a technician monitor your system 24/7.

As Certified Rachio Pro installers, we set up zone monitoring as part of every smart controller installation. It's one of the most underrated features of the system.

Step 7: When to Call a Professional

Here's where DIY troubleshooting hits its limits.

You can handle:

• Checking and opening shutoff valves
• Replacing a broken sprinkler head or cleaning a clogged nozzle
• Checking controller voltage with a multimeter
• Running the ohm test at the controller terminal strip

Call a pro when:

• You need to locate buried valves you can't find
• Multiple zones are dead and ohm readings show wiring problems
• The controller outputs voltage but nothing happens in the field (buried wire fault)
• You're getting readings you can't interpret
• The master valve won't open even when bled manually

Professional irrigators carry wire tracers and valve locators — tools that send a signal down the wire and follow it underground to find breaks, shorts, and buried valves. These tools cost $500-$2,000 and aren't worth buying for a single repair. A diagnostic visit with professional equipment costs far less than the hours you'd spend digging blind.

What to Tell Your Technician

If you've followed this guide, you already have valuable information that saves your tech time — and saves you money:

• Whether it's one zone or the whole system
• Whether you checked the shutoff valves
• Whether the controller is outputting voltage (and what you measured)
• What your ohm readings were (if you tested)
• Whether you bled the master valve and got water flow

This lets them bring the right tools and parts on the first trip instead of starting from scratch.

Quick Reference: Diagnostic Flowchart

No Zones Work

1. Check water shutoff at backflow — open if closed
2. Bleed master valve — water flows? Yes: Check controller voltage. No voltage: controller issue. Has voltage: check master valve wiring
3. Bleed master valve — no water? Water supply issue upstream

One Zone Won't Work

1. Check controller voltage on that zone terminal — no voltage: controller issue
2. Has voltage — check ohms between common and zone wire. OL = broken wire. 16-70 ohms = bad solenoid
3. Bleed that zone's valve manually — water flows: electrical problem. No water: valve or supply problem

Heads Won't Pop Up (System Runs)

1. Check other heads on same zone — all weak: zone pressure problem (valve or leak)
2. One head weak: clogged nozzle or broken riser — clean or replace

Frequently Asked Questions

My controller screen is on but nothing runs. Is the controller broken?

Not necessarily. The display can run on battery backup while wall power is off — the backup keeps the clock but can't power valves. Check that the outlet has power and test for 24 VAC at the zone terminals. If no voltage, the transformer or output board may be dead.

Can I test my sprinkler wiring without a multimeter?

You can do a basic test by swapping wires at the controller. Move the wire from a dead zone to a terminal that's working. If the zone comes alive, the wiring and valve are fine — the controller terminal is bad. If it stays dead, the problem is in the field wiring or solenoid.

Why does my sprinkler system work sometimes but not others?

Intermittent failures almost always point to a damaged wire connection — a splice that makes contact when the soil is wet (expanded) but breaks when the soil dries out (contracts). This is extremely common in DFW's clay soil. A wire tracer can find the damaged splice.

How much does it cost to diagnose a sprinkler problem?

Professional diagnostics with wire tracing and valve locating equipment typically run $50-$150. See our complete pricing guide for detailed cost breakdowns of common repairs in the Dallas-Fort Worth area.

My sprinkler heads pop up but barely any water comes out. What's wrong?

Low pressure on a single zone usually means the valve isn't opening fully (stuck diaphragm) or there's a significant leak somewhere on that zone's pipe. If ALL zones are weak, check the main shutoff — it may be partially closed — or your home's water pressure may have dropped.