5 min read · Updated
Start with the easy checks
Before assuming something is broken, rule out the simple causes. These take a few minutes and solve a surprising number of problems.
- Make sure the controller is not in rain or off mode, and the rain sensor is not wet
- Confirm the zone has a run time in the program you are using
- Run the zone manually from the controller to see if it starts
- Check that the water supply to the system is fully open
1. A bad solenoid
The solenoid is the small electrical part on top of each valve that opens it. Solenoids wear out over time, and a failed one is the most common reason a single zone stops running. It is usually a quick, inexpensive fix.
2. A cut or damaged wire
Wires between the controller and the valves run underground. Digging, aerating, new landscaping or rodents can cut them. If one zone stopped working right after yard work, a damaged wire is a strong possibility.
3. A worn or clogged valve
The diaphragm inside a valve can tear, and debris from secondary water can clog it. The valve may not open at all, or it may stay stuck open and keep running.
4. A controller problem
If several zones stopped at once, or the controller screen is blank or flashing, the controller itself or its transformer may be the problem. Older controllers can fail after power surges.
5. Low water pressure
Sometimes the zone does turn on, but the pressure is too low for the heads to pop up. A clogged filter, a partly closed shutoff or a leak elsewhere in the system can all cause this.
6. A leak or break in the line
A broken lateral line lets the water escape before it reaches the heads. Look for soggy spots, bubbling ground or unusually green strips of grass.
When to call a pro
If the easy checks do not fix it, the problem is usually underground or electrical. Pure Irrigation repair visits have a $39.99 service fee that covers the trip and the diagnosis. You get an up-front quote before any repair, and most repairs run $250 to $750.
Want a pro to handle it?
Pure Irrigation serves homes across Salt Lake County and Utah County.
Book a repair visitCommon Questions
How much does it cost to fix a sprinkler zone that will not turn on?
Replacing a solenoid is usually a smaller repair. Tracking down a cut wire or replacing a valve takes longer. Our $39.99 service fee covers the diagnosis, and you get a quote before any work.
Can I replace a sprinkler solenoid myself?
Often, yes, if you can find the valve and match the part. Turn off the water first. If the problem is not the solenoid, a pro can test the wiring and valve for you.