Landscaping Questions? Ask a Landscaper for Answers ASAP
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How are you opening the solenoids? with the controller? manually?
The main valve will always be open when a zone is open if it's wired right. The best way to do this is to either open each zone in succession manually at the controller or by going to the valves and opening them manually (no power from the controller).
The valves open when power is applied to the solenoid. What is going through the lines (water or air) has nothing to do with the valve opening or closing. Do you know how to open 1 zone at a time manually from the controller?
Then that's how you blow out the system, by opening 1 zone at a time manually at the controller. Are you waiting for the cycle to time out? Normally ONE (only one) zone will stay open for 20+ minutes then the next zone opens.
Do you have any more questions?
I've been around for a while. You pick up a lot if you pay attention.