Why does only one station fail to run?

When one station fails and the rest work, the cause is usually on that station's path: its wire, a connection in the valve box, its solenoid or the valve itself. When several stations fail together, look back toward the controller, its power or a shared common wire. Electrical testing is for a qualified technician.

Irrigation Controller Repair

Find out why a timer skips, repeats or runs the wrong station, and leave it with a schedule that fits the season.

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Separate a programming problem from a hardware one

Many controller complaints are programming, not failure. Overlapping start times, a second program left active from last summer, a rain delay that was never cleared, or a seasonal adjustment percentage set far from 100 can all make a timer look broken. The first check reads every program in full: start times, station run times, watering days and any budget or delay setting, written down before anything is changed.

If the program is sound and a station still does not run, the fault is somewhere between the controller terminal and the valve. A station that fails on its own points down that one wire path or to its valve; several stations failing together points back toward the controller, its power supply or a shared common wire. Electrical testing at the terminals is work for a qualified technician, and a dead display after a storm is a reason to stop and have the unit checked rather than reset repeatedly.

Sun City homes went all-electric from 1970, the Del Webb Sun Cities Museum notes, so after a monsoon outage check the household breaker and outlet feeding the controller before blaming the unit itself.

Leave a schedule that changes with the year

A repaired controller is only as good as the schedule it runs. Regional guidance from the Arizona Municipal Water Users Association is to revisit the schedule four or more times a year, since cool-season demand is far below summer's, and to run turf stations in the small hours during warm weather. A practical handover lists each station, what it waters, its run time and how often it runs, and shows where the seasonal adjustment lives so it can be changed without reprogramming everything.

If the controller is old or keeps losing its program, replacement may make more sense than repair; smart irrigation controllers explains weather and soil-moisture options. A station that runs but leaves the zone dry belongs with valve and solenoid repair.

Source: Arizona Municipal Water Users Association, Watering Schedules, Checked Oct 1, 2026