Fixing Leaky Sprinkler Heads and Low-Pressure Zones

Two Common Sprinkler Problems: Weeping Valves and Weak Spray

A homeowner has two issues: (1) several areas stay wet, suggesting valves don't fully close, and (2) one zone runs but heads only seep water.

Problem 1: Valves That Won't Shut Off

This is usually a weeping valve caused by debris on the diaphragm or a worn diaphragm. While you can rebuild the valve, replacement is recommended—it's not much more expensive and gives you a fresh, reliable unit.

Problem 2: Zone Runs But Heads Only Seep

First, adjust the flow control on the valve:

1. Open the flow control fully.
2. Close it completely, counting turns.
3. Reopen to half the turns.

If that doesn't help, check electrical connections at the valve and controller. Ensure wire nuts are waterproof. A bad solenoid or controller output could also cause weak activation.

Key Takeaway

Start with mechanical adjustments (flow control), then move to electrical checks. Replace valves that weep after cleaning.