What does 5En or SEn on the LCD mean?

When is “Sen” normal to be seen on an Irritrol RainDial?

“SEn” or “5En” indicates SENsor.  It is displayed when an (optional) external rain sensor device detects that it has rained.  If you have a rain sensor and it is sensing rain, it should display “SEn” and stops the watering schedule until the rain sensor indicates the rain has stopped and water is needed again.

What to try if you do not have an Irritrol RainDial or other rain sensor:

  1. Some back connector boards have a rain sensor selection switch that can be set to either Bypass or Active. Make sure it’s set to Bypass if you don’t have a rain sensor.
  2. If you have sensor connection screws but no switch, (and no rain sensor or you removed a sensor that’s no longer being used) there should be a jumper wire between the two screws.  If the wire is missing you can just add a wire between the two sensor screw terminals.   FYI: The switch on the board (if you have one) basically does the same thing as the jumper, it connects the two sensor terminals together.

The most likely problem:

Most of my customers get this message and do not even have a rain sensor.  It’s usually a “real” problem that will be intermittent and eventually get worse as time goes by and it’s hard to detect because the message may only appear when you are not looking at it.

It’s caused by a circuity problem that we frequently repair.  Simply mail the controller module and back connector board to us and we’ll have working better than new in no time.

(c) This material is copyrighted


6 thoughts on “What does 5En or SEn on the LCD mean?

  1. Hi,
    not sure of the model, its the dark blue one.
    anyways, it will not keep the current time correctly. I set it and a day or 2 later it changes. So consequently the system is not watering when its suppose too. Its also giving me the “SEn” message.
    I am able to turn on manually tho.
    Can you fix this?

    • Hi Laura,

      That sounds like the exact problem I see all the time and repair. I’d suggest sending the timer and also the back terminal board for repair. Repair Instructions are on my site, but it’s also easy to just email me at rainDialDoctor@gmail.com. I’ll get back to you within the day.

      Thanks for posting,

  2. Hello,
    I have a Sen notice flashing. I have reset my system and reset the sensor switch… it is still flashing. Also when I do switch the system to off my water is still on. Do you have any suggestions? Also what is the average cost to have this fixed if I do need to send it in?
    Thank you for your help,

    • Hi Katrina,
      Sen is short for sensor – it indicates that the timer has detected rain from an external sensor (if you have one). If you don’t have one, it’s a common problem that I repair. Just the module the dial/lcd part AND the back connector board. See both videos on the “how do i send it for repair page. It’s usually around $45 and I pay to ship it back.

  3. This information is spot on!!!! I had the jumper wire and it seemed secure. I removed it and reinstalled it and the problem went away. I will keep checking but this is an easy fix. Thanks

    • I’m glad to hear it helped.

      FYI: I don’t get paid by Irritrol or anyone for this website and all the RainDial information here. If you found it helpful, please consider giving me a “High $5”. You can do that by clicking on the Home Page “Pay Now” button. All proceeds go to children’s education.

      Thanks much,

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