One Sprinkler Zone Not Working in Glendale? Check This

Why does only one sprinkler zone not work?

One zone fails alone because something only that zone uses has failed. Every station has its own program setting, its own wire from the controller, its own valve and solenoid, and its own lateral pipe and heads. Shared parts, such as the supply line, the backflow assembly and the controller's power, would stop every zone at once.

That gives you a short list. Work through it from the cheapest check to the most invasive: the program, the wire, the valve, and finally the pipe and heads. EPA WaterSense recommends inspecting each zone in turn for exactly this reason.

Step 1: Run the zone from the controller

Most controllers have a manual or test mode that runs one station on demand. Use it, then walk out and look.

• Nothing happens, and no click at the valve. The signal is not reaching the valve. Suspect the program, the wire or the solenoid.
• You hear the valve click, but no water flows. The solenoid is working, but the valve is not opening. Debris, a stuck diaphragm or a closed flow control are likely.
• Water flows but the heads barely rise. That is a pressure or flow problem, which may be a crack in the lateral, a partly closed valve or the city's peak-hour pressure dip.
• The zone runs fine by hand but not on schedule. The fault is in the program, not the hardware.

Step 2: Check the program

Program faults are common and free to fix. Look at the station's run time, its watering days and the start times for each program. A station with a run time of zero, or one assigned to a program with no start time, will never run on its own. Seasonal adjust, sometimes called water budget, can scale a run time down to almost nothing. A rain hold left on after a monsoon storm will stop every zone, not just one, but check it anyway.

The Arizona Municipal Water Users Association recommends adjusting schedules at least four times a year, and every adjustment is a chance to set one station to zero by mistake.

Step 3: Is it the wire or the valve?

If the station will not run even by hand, the electrical path is the next suspect. Each zone has its own wire from the controller to the valve's solenoid, plus a common wire shared by all valves. Damage to one zone's wire, from a shovel, a new fence post or a rodent, kills only that zone.

Signs that point to the valve rather than the wire:

• the valve box is full of water or mud;
• the solenoid is loose, cracked or corroded;
• the zone starts if the solenoid is turned a quarter turn by hand, the manual bleed on many valves.

Testing wire with a meter and opening a valve are jobs many owners hand to a professional, and the valve and solenoid repair page for Glendale explains what that involves locally. Our guide to signs an irrigation valve is failing covers each valve symptom in more detail.

Could Glendale's water pressure make a zone look broken?

Yes. The City of Glendale says it has four pressure zones and that pressure may drop during the peak demand hours of 6 to 8 a.m. and 6 to 9 p.m. A zone at the end of a long line, or one with many heads, can fail to pop up in that window and work normally later in the morning.

The City of Glendale Your Water page explains that pressure depends on which pressure zone the home is in and on demand at that moment. So before anything is replaced, run the same zone at its scheduled time and again at mid-morning. If it works at 10 a.m. and fails at 6:30, moving its start time earlier, before 6 a.m., may be the fix. AMWUA suggests watering turf between 1 and 7 a.m. in the warm months anyway. If you see misting and weak heads on several zones, read why Glendale sprinkler heads mist or will not rise.

Step 4: Look for a broken pipe or blocked heads

If water flows but the zone is weak or patchy, walk the zone while it runs. A cracked lateral pipe usually shows up as a soft or soggy patch, water bubbling up between heads, or heads that get weaker the farther they sit from the valve. Over the caliche common in Arizona soils, which University of Arizona Cooperative Extension says can stop water from soaking down, the wet spot can surface a few feet from the actual crack.

Blocked heads are the other possibility. Grit from a pipe repair or a monsoon storm can lodge in nozzles and screens. If every head on the zone is weak, check the valve's flow control and the line. If only a few are weak, clean or replace those nozzles.

Glendale situations worth mentioning when you call

A few local details change what a repair visit should look at:

The last two rows come from the City of Glendale's Drought Management Plan, which defines water waste as runoff that travels 250 feet or pools over 200 square feet, and its General Plan, which notes county islands between 75th Avenue and El Mirage Road.

When to stop and get help

Stop when the next step means opening electrical housings, digging near the backflow assembly or cutting pipe. A zone that will not shut off is the urgent case: close the irrigation supply valve, often at or near the backflow assembly, so the water does not run into the street overnight.

When you ask for an estimate, give the station number, what you saw in each step above, and the time the zone is scheduled. The sprinkler repair in Glendale page explains what a local repair covers, the irrigation controller repair page covers timer faults, and the Glendale service area page lists every service.