2 out of 4 zones suddenly don't work

Discussion in 'Irrigation / Sprinkler Forum' started by Mikeaz, Jul 2, 2007.

  1. Mikeaz

    Mikeaz New Member

    Messages:
    3
    I have an automatic system with 4 zones. Today I noticed that 2 of the four zones have virtually no pressure. I'm not a irrigation pro, just a typical handy homeowner who can intstall valves, sprinkler heads, timers, tubing, do minor repairs, etc.

    No water pressure on two of four valves of a system that has been in use for years...was working recently, no pressure when run with the timer, no pressure when tryiing to operate manually.

    Any help?

    Thanks
  2. Kiril

    Kiril New Member

    Messages:
    87
    Location:
    Sacramento, CA
    Pressure problems like that usually means a broken pipe or riser.
  3. prashster

    prashster New Member

    Messages:
    941
    When you say 'manually' do you mean running a single station through the controller? Do you have the provision to manually turn the valve on and off from the valve box?

    If you leave one of the 'bad' zones on for 5-10 minutes, do you notice a pool of groundswell somewhere? That'd point to a puncture. However, it's unlikely 2 zones would be similarly punctured or clogged at the same time (unless it's the beginning of the season and yr turning on after the winter).

    I also doubt that 2 valves would simultaneously go bad.

    My nonpro instinct is that it's a problem in the electrical connections to the valves.
  4. Verdeboy

    Verdeboy In the Trades

    Messages:
    2,051
    If you've opened the valves manually and there's still no pressure, then you have either a mainline leak or a clog just upstream from the first zone that doesn't work. Usually, with a mainline leak, it becomes pretty obvious where it is. For a clog, you'll have to do some digging.
  5. Mikeaz

    Mikeaz New Member

    Messages:
    3
    By manually, I go to the valve and turn the solenoid and/or the bleed screw, not related to the sprinkler timer/control.

    No winter here in Phoenix. Sounds like I should run one of the bad zones and then look for the wet spot, hopefully? Between the main line and the valves?

    Only going to be 113 here today so not too excited to dig for a broken pipe, but it is what it is.
  6. Kiril

    Kiril New Member

    Messages:
    87
    Location:
    Sacramento, CA
    I would look for broken risers first.
  7. Mikeaz

    Mikeaz New Member

    Messages:
    3
    When I manually open the valves there is barely any water pressure getting TO the valves and passing through the valves on the two zones that aren't working. Mostly Drip irrigation and a few sprinklers...I don't notice anything broken or puddling in those areas.
  8. Verdeboy

    Verdeboy In the Trades

    Messages:
    2,051
    You need to troubleshoot the main line that goes from the the last valve that is working to the first valve that is not working. That means doing some digging.
  9. Rancher

    Rancher Guest

    Are all four zone/valve on the same supply line? Perhaps there is a valve to these two zones that someone have closed. I'm keying on your quote "TO".

    Rancher (Sierra Vista)
  10. Mr_Pike

    Mr_Pike New Member

    Messages:
    136
    Location:
    Nebraska
    Are all 4 valves in the same box and on the same manifold?

    Can you describe your system in a bit more detail?
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