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


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

  1. How much does it cost me to send module and circuit board for repair? I got the sen code and it is in bypass and even has jumper on screws.

    • Hi Martin,
      Thanks for commenting, that sounds like a problem we typically see. I have repair information on my website here. Make sure to send both the controller and back connector board.


  2. I have the 600 series and the sen is on, however i want to turn it off so i can manually run the sprinklers. when i turn it on to man and the time say MAN3min its doesn’t run.

    • Hi James,

      I’m assuming the sensor is active because it has detected rain.

      You should have a small switch on the back terminal board above the fuse.

      Switch it to bypass and the timer should work regardless of the sensor.

      Let me know if that helps or not.

  3. I recently purchased the ClimateLogic cl-100 wireless sensor kit for my rd-600 controller, but not sure if I have installed it correctly. The display and rain detection work fine, as the display shows when it has rained, and what percentage of water is required, but when I move the bypass switch inside the RD600, the display flashes Sens, which I take it means that it is not going to water because of rain, but that isn’t what the Climatelogic panel says, it says no rain. I noticed there was a jumper wire on the terminal block for the sensor as well, so I removed that, but no change, it still flashes Sens, any ideas?

    • Hi Peter,

      You are correct; if you have the sensor installed, you need to remove the jumper wire and put the switch to active, NOT bypass.
      Do you have an RD-600-R model, or just RD-600? I suspect it’s an RD-600-R. If so, email me a picture of your wiring to rainDialDoctor@gmail.com and I’ll take a look. I suspect the sensor setting or wiring is set for normally open instead of normally closed (or visa versa) and you need to switch it.

      Let me know if that helps,

  4. I have disconnected the rain sensor, but SEn is still flashing while my yard is dying from this heat. I have the 1200R and I don’t see a bypass switch on the back panel. Any suggestions?

    • Hi Mike,

      Send the timer and back terminal board in for repair. You can use the valve’s manual feature (not the timer, but at the valve itself) to water in the mean time.


  5. 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,

  6. 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.

  7. 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,

Leave a Reply

Your email address will not be published. Required fields are marked *