Practical diagnosis of the most common sprinkler and irrigation problems. Learn what each symptom usually means and what you can safely check before calling for repair.
You’re looking at a dry strip of lawn. Or a head that’s shooting water sideways. Or a zone that just won’t turn on no matter what you do at the controller.
Most people start guessing. Broken head. Bad valve. Controller’s dead. Sometimes they’re right. A lot of the time they’re not — and they either waste an afternoon or call a tech for something that was simpler than it looked.
Here’s a better way to find common irrigation problems. Start with what you can actually see and hear. Narrow the problem the same way a good tech does when they first walk up.
First Question: Is It One Zone or the Whole System?
This single question cuts the irrigation problem in half.
If nothing runs at all
The usual suspects are:
- Water supply shut off (backflow or isolation valve)
- Controller has no power or is in rain delay / off
- Common wire is damaged
- Master valve or pump issue (if the system has one)
If only one zone is dead
You’re almost always looking at that zone’s valve, solenoid, or field wire. The rest of the system can still prove the controller and water supply are fine.
If several zones are acting up but not all of them
Think shared wiring, partial controller failure, or a few solenoids that failed around the same time.
Don’t skip this step. It saves a lot of unnecessary digging.
The Irrigation Problems We See Most Often
Broken or Clogged Heads
This is the classic one. A head gets hit by a mower, settles below grade, or clogs with sand and debris. In Central Florida, the UV also makes plastic brittle faster than in cooler climates.
What it looks like: Geyser, weak spray, head that won’t pop up, dry spot right next to a working head.
Quick check: Run the zone and walk it. Look for the obvious.
According to the EPA, a single broken sprinkler head or leak can waste thousands of gallons over a season — one reason small irrigation problems quickly become expensive.
Valve Won’t Open (or Won’t Close)
Valves fail in two common ways: they refuse to open, or they refuse to shut off completely.
A zone that never comes on often points to a bad solenoid, damaged wire, or stuck diaphragm. A zone that keeps running (or seeps) after the controller turns it off is frequently a worn diaphragm or debris inside the valve.
Useful test: Try the manual bleed on the valve. If it runs manually but not from the controller, the problem is electrical (solenoid or wiring). If it won’t run even manually, the valve itself is the issue.
Controller and Programming Issues
Sometimes the system isn’t broken. It’s just set wrong, stuck in rain delay, or the rain sensor is holding everything off. Lightning is also hard on controllers in Central Florida.
What to check first: Power to the controller, correct date/time, active program, rain sensor bypass, and whether a manual zone test works.
Low Pressure or Weak Coverage
Heads mist instead of spraying, radius shrinks, or one side of the yard looks under-watered.
Common causes: leak on the zone, partially closed valve, too many heads on one zone, clogged nozzles, or a restriction at the backflow. Underground leaks in sandy soil can be quiet — you may only notice an unusually green patch or a water bill that doesn’t make sense.
Wiring Problems
Especially the common wire. When the common is damaged, multiple zones (or all of them) can stop responding even though the controller looks fine.
One dead zone with good controller output usually points to that zone’s hot wire or solenoid. Multiple dead zones point toward the common or a shared connection.
A Simple Diagnostic Sequence You Can Run
- Confirm water is on at the backflow and any isolation valves.
- Check the controller: power, program, rain sensor, rain delay.
- Run each zone manually and watch what happens.
- Note whether the failure is one zone, several zones, or everything.
- At a dead zone’s valve box, listen for the solenoid click and try the manual bleed.
- Walk the running zones and look for broken heads, leaks, or dry arcs.
That sequence alone solves or correctly narrows a large percentage of residential calls.
Florida-Specific Notes That Matter
Central Florida adds a few extra failure patterns:
- Lightning takes out controllers more often than most people expect.
- UV and heat shorten the life of plastic heads and valve boxes.
- Sandy soil movement and tree roots crack laterals that looked fine for years.
- Mixed zones (turf and landscape beds on the same valve) are extremely common and create uneven watering that looks like a “problem” even when the hardware is working.
University of Florida irrigation audits have repeatedly shown that many residential systems have design or programming issues (mixed heads, wrong run times, turf and beds sharing a zone) in addition to pure mechanical failures.
What You Can Safely Do Yourself vs. When to Stop
Safe for most homeowners:
- Visual inspection of heads while the zone runs
- Cleaning a clogged nozzle
- Checking controller settings and rain sensor
- Confirming water supply valves are open
- Listening for the valve click
Better left to a tech:
- Digging for underground leaks
- Electrical testing of solenoids and wiring
- Valve rebuilds or replacements
- Pressure diagnosis across the system
- Anything involving the backflow preventer beyond a visual check
Guessing with a shovel is how small problems become expensive ones.
Related Reading
Irrigation Repair in Orlando: The Complete 2026 Guide
Top 5 Mistakes to Avoid in Landscape Irrigation
Smart Irrigation Systems in Orlando: Are They Worth It in 2026?
Professional Irrigation Problem Repair in Orlando and Central Florida
Frequently Asked Questions about Irrigation Problems
Why is only one sprinkler zone not working?
Usually the valve, solenoid, or the wire that serves that specific zone. The rest of the system working is a useful clue.
Why won’t my sprinklers turn off?
A valve that won’t close (worn diaphragm or debris) or a controller still sending power to the zone are the two most common reasons.
Can a bad rain sensor stop the whole system?
Yes. Many systems won’t run at all if the rain sensor is active or faulty. Check the sensor bypass setting on the controller.
How do I know if I have an underground leak?
Unusually green or soft spots, higher water bills with no other explanation, or one zone that loses pressure compared with the others are common signs.
Is low pressure always a leak?
No. It can also be a partially closed valve, clogged nozzles, too many heads on a zone, or a restriction at the backflow.
When should I just call for service?
If the irrigation problem isn’t obvious after a basic zone-by-zone check, or if it involves valves, wiring, or digging, a diagnostic visit is usually faster and cheaper than continued guessing.
Final Thoughts
Most irrigation problems announce themselves clearly once you know what to look for. The mistake is treating every symptom as a mystery.
Start with one zone versus the whole system. Watch what the heads actually do. Listen at the valve. That sequence answers a surprising number of questions before anyone opens a toolbox.
If you’ve run through the basics and still can’t pin it down, or you’d rather not dig into valve boxes yourself, request a diagnostic evaluation. We’ll find the real irrigation problem and tell you exactly what it will take to fix it.
Call or text (407) 951-8586, or request your free irrigation problem evaluation online with J. Irrigation Repair in Orlando.
From our family to your yard. Diagnosing and repairing Central Florida irrigation systems since 2007.
