I'm not sure what happen, my sprinkler system works
I swap the zone 2 solenoid to zone 1 (I suspect zone 2 solenoid is damaged, just testing if it works on zone 1). Then I turn all the solenoids to clockwise position manually. Turn on station 1 on the controller, Wahlah! It works. Turn on station 2 working, station 3, and 4 working perfectly.
BUT ...
I setup timing to turn on at night 7pm, each station for 10 minutes duration. At night, I come out and check, the station 1 turn on ok. When it finishes, station 2 turn on but station 1 stay on. When station 2 finishes, station 3 turn on and now all three stations are on. What the ......
In the morning, I rotate each solenoid and turn to clockwise position again. Turn on the controller, everything is working in order !!
This means it is time to change all the solenoids