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How to test/repair solenoid on irrigation system?

How to test/repair solenoid on irrigation system?

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  #1  
Old 01-19-20, 11:59 AM
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How to test/repair solenoid on irrigation system?

I had replaced a Toro Lawn Master Timer for my irrigation system, about 6 months ago and now I am
having an electrical problem. The Unit indicates (flashing no A/C) that it is not connected to any electrical source so I confirmed that the outlet to which the transformer is connected has power. So the problem is
that the transformer is probably burned out. Given it is a fairly new unit I think that maybe one or multiple ( I have 3 zones) of the solenoids may be stuck/malfunctioning... So I need to know how to test the solenoids and
if defective how to replace them.
Would appreciate any info on how to proceed.

Thanks
 
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  #2  
Old 01-19-20, 12:45 PM
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You can manually open the valve to verify they are in order, you can then remove the solenoids and apply power to confirm they are good, then it's just a matter of checking the continuity of the wire!
 
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Old 01-19-20, 01:48 PM
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Thanks... Do I have to shut off the water prior to opening the valve? If so I got a bit of digging to do.
 
  #4  
Old 01-19-20, 03:36 PM
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No, manual test needs pressure to turn on, the solenoids are not part of the water circuit!
 
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Old 01-19-20, 08:12 PM
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If you think you have an electrical issue with the valves then you will need an ohmmeter. You will need to check from common to each zone wire. The three measurements should be very close. A typical resistance to be measured should be between 20-60 ohms per solenoid. Anything close to 1-2 ohms would be a short.
 
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Old 01-20-20, 11:13 AM
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Marq1, Pjmax.. initially let me thank you for your very helpful responses.. Another question (hope I am not driving you nuts) ... Do I have to shut off the water before I take the Solenoid out to replace it.. when the irrigation was installed the installers did not cover the shut off controls with a box (novice me knew no better to challenge them) , and control valves are buried really deep, so I have quite a bit of digging to do and if I can avoid that it would be great...
Once again thank you ..
 
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Old 01-20-20, 09:22 PM
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Your shut off valves should be in an easy to access location in case of servicing or line break.
Having them buried below ground is not terribly effective.

Most valves require the water to be shut off for servicing.
 
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Old 01-21-20, 05:32 AM
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Agreed, thanks for the help.
 
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