Low Pressure & Coverage Repairs

If every zone has low pressure, the problem is upstream of the valves — check the water supply, backflow preventer, master valve, or main line for restrictions.

If only one zone has low pressure while others are fine, the problem is isolated to that zone — a partially open valve, a lateral leak, or too many heads on the zone.

Dry spots are usually caused by head-to-head spacing gaps, clogged nozzles reducing throw, or heads that have shifted direction. Adjustments are usually all that's needed.