Just bought a home with a sprinkler system. Having a problem with zone 3. Zones 1 and 2 work fine. When Zone 3 is activated (either with the bleed screw or the system) it starts strong spraying water like normal but then dies out within id say 1-2 minutes and starts spraying in spurts. I tried swapping solenoids and diaphrams with no success. Also took the heads out to try and clean the line out. One of the 2 heads on this valve bubble water up out of the hole. The second barely has any pressure coming out once this happens. Any ideas would be great.
A leak, or excess design flow, is drawing down the water level in the well. Start shutting down nozzles, and capping off heads, if need be, until you pinpoint the problem.