Irritrol System: Loud Noise at Cycle Start, Vibration in Crawl Space

Irritrol system runs daily. Last 4 weeks: huge noise at startup, echo/vibration in crawl space.

Information Needed

• Water source: city or well?
• Can noise be reproduced manually during day?
• New system or existing?
• Noise duration: entire cycle or first few minutes?

Quick Test

Swap zone 1 wires with another zone at the controller. If noise moves with the zone, it's that valve. If noise stays on zone 1 position, it's a plumbing/system issue.

Possible causes: slow-opening valve, low-flow valve, water hammer, pump start surge (if well).