Irritrol gray 2400 jartop zone valve. Zone *used* to work. Voltage is being sent by controller, solenoid energizes. No water flow. Even if bleeder is opened, or manual on/off collar is opened, or all three at once. No water flow shows on water meter, and booster pump never comes on (pump comes on with pressure drop). Pressure steady. Recent extensive landscape work done: masonry walkways, flower beds, lots of digging done. Poly lines reported broken but repaired. I'm thinking maybe the landscaper repairs either capped off the line or they took the two ends of the tee'd line and connected them back again to itself. If the poly line was crushed, wouldn't there be SOME flow? I don't think it is the zone valve. Whenever I've seen a zone valve fail, it will not CLOSE. Never seen one not OPEN, even manually. No one wants to dig up area that was worked on. Probably will pull a new feed from the back manifold to re-feed affected area from it's other end. Might find the problem that way I'll bet. Any other ideas/suggestions?