Clock said "Short"

Discussion in 'Irrigation' started by Mike Leary, Jun 4, 2008.

  1. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,775

    WM SL & WM valves. Checked hi-fi wire connectors, checked splice box,
    removed field wires, ohm meter showed 33 ohms, fired valve from Progressive, worked, ran 24 volts from clock, cleaned field wires, installed
    new King blues, fired-up, worked. Deduced bad zone wire connection, though
    it still could be a bad coil, as they sometimes don't short until they heat-up.
    Did notice SL automatically removed "Short" from the display. Will check
    tomorrow after zone has it's normal run.

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  2. k911lowe

    k911lowe LawnSite Senior Member
    Posts: 526

    could be a short in the solenoid or the wiring. any new digging around?
     
  3. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,775

    Given the track record (not) of WM solenoids, I still suspect it. I always ask
    the digging question before tearing in. But once I re-wired it, all was well,
    so far.
     
  4. How does a bad zone wire splice lead to a short? Seems you would get an open read.
     
  5. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,775

    Does the SL show "open"? If it does, I've still got a solenoid heating up.
     
  6. Yes it will give an open read. You should try the output test and see the Ma reading.
     
  7. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,775

    I just looked in the book (which I had not before) & you are right. Being this
    is my first SL experience, I'd forgotten about it's diagnostic section.:hammerhead:
     
  8. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,775

    Now you got me curious, Peter, I'm going back to the site & learn the SL. Plus,
    there's a cool restaurant close by. Will let you know.
     
  9. There theory behind the door and the 24vac being disconnected is that there is no reason to ever open an SL after hookup. All diagnostics and valve locating (ping feature) can be done in the panel. I don't agree but whatever.
     
  10. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,775

    Put a on a manual zone run, fired, after about three minutes, it shorted,
    though the ohms were right when it was cold. Thanks, WM :hammerhead:

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