7 Common Sprinkler System Problems — and When It's Time to Call for Repair

An irrigation system is one of the best investments you can make in a lawn — right up until it starts quietly wasting water, drowning one corner, and leaving another bone-dry. The frustrating part is that most sprinkler problems are easy to miss, because the system runs while you’re asleep or at work. Here are the seven issues we see most on Richmond systems, what usually causes them, and which ones are worth a professional repair.

1. A zone that won’t turn on

You run the system and one zone just sits there. The usual suspects are a failed solenoid (the small electrical part that opens the valve), a stuck or damaged valve, a wiring break, or a controller issue. Occasionally it’s as simple as a tripped setting, but if the zone is dead across multiple cycles, something in the valve or wiring has failed. Diagnosing which one is a job for someone with the right tools.

2. A leak you can see — or one you can’t

Leaks are the single biggest source of wasted water. The obvious kind is a geyser from a broken head or a soggy, constantly wet patch over a cracked lateral line. The sneaky kind is a leaking valve that seeps continuously, keeping an area damp even when the system is off. If you have a spot that never dries out, or a water bill that climbed without explanation, suspect a leak. Underground leaks in particular are worth a professional look, because guessing where to dig gets expensive fast.

3. Low pressure or weak spray

Heads that barely pop up, or spray that doesn’t reach where it should, usually point to one of a few things: a leak somewhere upstream robbing pressure, a partially closed valve, a clogged filter or head, or simply too many heads on one zone for the available water supply. Low pressure across the whole system can also signal a problem at the backflow preventer or main supply. The fix depends entirely on the cause — which is why it’s worth diagnosing rather than just replacing heads.

4. Broken, clogged, or tilted heads

Heads take a beating from mowers, foot traffic, and vehicles. A cracked head sprays erratically or leaks; a clogged one sputters or stops; a tilted or sunken one waters the sidewalk instead of the lawn. These are the most straightforward repairs, and often the first thing a tune-up catches. A head that’s been off-target for a season explains a lot of mysterious dry spots.

5. Uneven coverage and dry spots

Brown patches in an otherwise green lawn are often a watering problem, not a lawn problem. If heads aren’t overlapping their spray properly — because of wrong nozzles, poor spacing, blocked spray, or a head that’s drifted off position — some areas get too little while others get too much. Before you assume a dry spot needs treatment, run the zone and watch where the water actually lands. A coverage audit is one of the highest-value things a tune-up does.

6. Overspray, puddling, and runoff

Water pooling on the lawn or running down the driveway means the system is applying water faster than the soil can absorb it — a common issue on central Virginia’s clay, which takes water slowly. It can also mean a zone is running too long, or heads are mis-aimed at hard surfaces. Shorter, repeated cycles (“cycle and soak”) often fix the runoff; mis-aimed heads need adjusting.

7. Controller and schedule problems

Sometimes the hardware is fine and the brain is wrong. Outdated schedules that still water like it’s July, a controller that lost its program after a power outage, or a rain sensor that’s stopped working all lead to over- or under-watering. Seasonal adjustment matters: a lawn needs far less water in October than in August, and a system still running summer settings wastes water and can encourage disease.

The one that’s seasonal: winterization

In Richmond, this is the repair that prevents the others. Water left in the lines over winter can freeze, expand, and crack pipes, valves, and backflow preventers — damage you won’t discover until spring startup. Properly blowing out the system before the first hard freeze is the single best way to avoid a costly spring repair. If you haven’t scheduled winterization yet, now is the time.

DIY or call someone?

Replacing a visibly broken head or adjusting a spray pattern is reasonable to handle yourself. But a dead zone, an unexplained wet spot, a pressure problem, a leak you can’t locate, or anything involving valves, wiring, or the backflow preventer is worth a professional — not because it’s impossible, but because misdiagnosing it costs more in water and parts than the repair would have.

How we can help

Our irrigation maintenance and repair service covers all of it: diagnosing dead zones and leaks, repairing and replacing heads and valves, coverage tune-ups, spring startups, and fall winterizations. And because a well-tuned system is what makes a healthy lawn possible — especially if you’re overseeding this fall — it’s worth getting right before winter. Reach out to schedule a repair or winterization.