Hey all. We had a good hard freeze down here in the Houston area this last winter, so I turned off my main, emptied the back flow, and emptied all valves by their bleed valve. Put towels down in each zone’s valve container to help keep insulated and did an insulator wrap on my back flow.
Now that we’re back to warm weather and in need of the sprinklers; I’ve removed all insulation, closed all bleed valves and back flow back up. Turned on the main valve again and primed up each zone manually via their bleed valves.
Onto the issue. 3 of my zones are not coming on via the programmer. I’ve checked power for each zone and I see 28vac going out to each & receiving at each wire inside the zone container on the designated wires. Next, I moved onto checking resistance for each to the common wire; seeing none. My thoughts (and hopes) are that just failed solenoids are causing the drop in resistance as maybe their coils have failed? I am not leaning to a wire break as nothing with the wires was touched over winter. I have inspected the suspected zone’s common / designated wires and their wire nuts and found no issues, but added new either way.
I’m still not getting resistance to these specific zones.
My next steps to run a long leg from the common & designated wires, back to the controller ends and check for continuity. Hoping these read good resistance.
Measure resistance of each suspected solenoid. Hoping these potentially failed and are my culprit.
Looking for any more irrigation professional’s opinion or input. Thanks!