Rain Bird Valve Works But Only One Head Runs: Post-Installation Debris

Debris from Valve Replacement Blocks Downstream Flow

After swapping Hunter valves for Rain Bird, one zone only runs the head closest to the valve. No water reaches the others, even with heads removed. This indicates debris (stone, pipe shavings) lodged in a fitting during the valve change.

Locate the Blockage

1. Start at the first non-working head. Cut the lateral pipe just downstream of its swing joint or tee.
2. Turn on the zone. If water flows, the blockage is further down. Move to the next fitting.
3. Repeat until you find the dry section. The obstruction will be in the fitting just upstream of the dry cut.
4. Remove and clean or replace that fitting.

It’s a process of elimination, but finding the blockage is satisfying and restores full zone operation.