When a zone energizes but delivers no water, what is the first recommended diagnostic step?

• A. Check controller programming
• B. Verify 24V supply to the zone valve/solenoid
• C. Inspect wiring
• D. Test the valve for leakage or failure

Answer: (A)

The first step is to verify the controller programming. If a zone is energizing but no water is delivered, the issue is often in how the controller is commanding the zone rather than in the valve or wiring. By checking the program, you confirm that the station is actually scheduled to run, the correct run time is set, and the zone is mapped to the right valve. A misconfigured start time, run duration, or zone assignment can make the solenoid energize without producing water because the call to water isn’t aligned with the field valve’s operation. If the programming checks out, then move on to inspect power to the valve, wiring, and finally test the valve for leakage or failure.