DIY Troubleshooting

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Scroll down to see the many DIY troubleshooting topics below

Please go through the following DIY list; if you don’t see what you are looking for, you can look through the Q&A and/or ask a new question about your sprinkler timer.

This do-it-yourself page will help you troubleshoot and diagnose problems with the Irritrol Rain Dial RD-600 and other irrigation systems.  We don’t want you to send in a sprinkler timer in for repair if it doesn’t need it. Click the links below to navigate the troubleshooting sections.  If you’re asking “How do I …”, keep reading.

For RainDial RD-600, 900, 1200 PROGRAMMING HELP and manuals, click here

Choose the Rain Dial RD600 series problem DIY troubleshooting topic below.

  1. Rain Dial Sprinkler/irrigation valves chatter or buzz or water pressure seems low.
  2. Rain Dial Display says FUS or FU5 and a number
  3. Rain Dial Display shows 5En or SEn
  4. Rain Dial Display shows OF1 or OF… some number
  5. Rain Dial Dispaly shows P:On or P:Off
  6. Rain Dial Display shows OFF or blinks when turning on a valve manually
  7. Rain Dial Display is blinking – see above
  8. Rain Dial Time is frozen or cannot change the time
  9. Rain Dial Valves do not come on when they’re supposed to
  10. Rain Dial Determine if the valves are good
  11. Rain Dial Valves are stuck on or come on when they’re not supposed to
  12. Rain Dial Valves will not shut off
  13. Rain Dial The case door won’t open or you lost your key 
  14. Rain Dial The case door breaks off or comes apart
  15. Rain Dial Plus displays “Opn” or “Open”

Choose from Other Helpful Rain Dial and DIY troubleshooting “How do I …” topics below

  1. RainDial How to check the fuse
  2. Rain Dial How to test the transformer to know if the transformer is bad
  3. Rain Dial How to test if the valves or solenoids are bad.
  4. Rain Dial How to reset the RainDial controller and set it to factory defaults
  5. Rain Dial Programming tutorial
  6. Rain Dial Programming worksheet
  7. Rain Dial Typical Sprinkler Valve Wiring Diagram

Here is a video showing common symptoms that indicate when a Rain Dial Controller needs to be repaired.

If this information wasn’t enough to resolve the issue, we can help:
Send Rain Dial Timers in for repair?

RD600 Repair

Irritrol Rain Dial RD600 repair services

For other issues, or ones that are in progress and do not have a link yet, just contact us, or see details here: How do I send it in for repair?


148 thoughts on “DIY Troubleshooting

  1. I have the 600 rd and after we had a power outage, i tried to run the system on manual but only dials 4,5,6 worked. Nothing from 1,2,3

    • Hi Michael,

      If 1,2,3 are grouped together and 4,5,6 are in another grouping (e.g., one set is in the front and the other in the back) then you probably have a faulty ‘common’ wire. Look at the wire(s) that go to the VC or VCOM screw terminal of the backboard and check them. If they’re grouped like i suspect, the common wire going to valves 1,2,3 is disconnected or loose in some way.

      If that doesn’t work, you can try following the reset instructions on the DIY page, but I suspect it’s a wiring issue as mentioned,
      Let me know what you figure out,
      -aka the RainDial Doctor for RD600 series timers.

  2. Hello,

    Thank you for checking out my question in advance. I just had the RD-900 installed and my sprinklers aren’t popping up anymore. Water pressure hasn’t changed either. Any ideas?

    • Hi Pete, I need a little more info. Is the timer displaying anything. Dies it indicate the valves should be on by showing the valve number in the top of the display? Does the display show when the battery is removed?

      Tell me more, and I can help more.

    • Hi Georgios,

      There’s an extensive explanation of the FUS message on the DIY Troubleshooting page. See item #2. It’ll explain what typically causes the problem in the RD-600 series timers as well as how to troubleshoot it, how to get parts, and how to clear the message.

      Thanks for posting

    • hi , You should be able to just keep pressing the + button on the RD-600 or other model until you get past the am settings… after 1159pm, you should get 12:00am

      Brian – aka the RD600 series Irritrol RainDial Doctor

    • HI Brandon,
      That’s usually an indication of a problem with the RainDials I can repair – drop me an email at with more details and I’ll give you all the info on repair costs, etc.


  3. I have a RD900 and on occasion the screen just goes blank. I’ve unplugged it and plugged it back in, tightened all the internal screws and nothing. I plugged it back in and nothing, I pulled on the AC cord and the screen came back on and everything worked (for a while). Now it comes on and goes off whenever it wants. I play with the wires aand it works. I live in Ca. so under the budget we are on I only use it manually but some times it takes a long time before it will stay on. Is this a common problem?

    • Hi Terry,

      Yes, that’s a common problem I repair. I’d suggest sending in the timer and back terminal board for repair. You’ Never have that problem again and I’ll also add some other enhancements so you won’t have the other problems either.
      I usually get them in the mail the day after I receive it.

      Thanks for posting; If you have any other questions just let me know.


  4. I have 9 dials wired to my yard. First seven work great. Other two in the back never turn on via the controller. They turn on manually. I put in all new valves and still not working. Not sure what the issue is.

    • Hi Brian E,

      I assume you have 9 valves, and not 9 dials… 🙂
      If the two in the back don’t come on but the timer indicates they should be on, I would look closely at the common wire that goes to the back valves. It’s likely that it’s loose or not connected well. Let me know if you find anything or not… If not, I’ll offer additional suggestions; be sure to give me more info on the model number of the timer (listed near the semi-auto button).


  5. Hi Brian,
    Thanks for posting answers to many of the questions in the forum. My RD-600-EXT suddenly stopped working, i.e. it is not triggering my sprinkler head. As you could see, there is power going from the transformer to the board; however, I did not sense any power in blue, green, red and white wires (see attached photo). Also, there is no power in the front LCD panel.

    What could be the problem. Appreciate your help.


    • Hi Marc,

      You’re very welcome. I think I replied to your email, so if you still have questions after reading that, just let me know.


  6. Hi Brian,
    Thanks for posting answers to many of the questions in the forum. My RD-600-EXT suddenly stopped working, i.e. it is not triggering my sprinkler head. As you could see, there is power going from the transformer to the board; however, I did not sense any power in blue, green, red and white wires (see attached photo). Also, there is no power in the front LCD panel.

    What could be the problem. Appreciate your help. I just sent you an email as well – with a small video clip.


  7. I have a Rain Dial Irritrol RD600. A couple of days ago, I noticed the indoor control for my backyard spa (Jandy aqaulink) say “Air Sensor Shorted” and the backyard lights wouldn’t turn on. Over the past couple days, I also noticed the sprinklers did not turn on in the morning like they normally would (I think the two issues are linked?). So I checked my RD600 and the display window is blank. I don’t think the transformer breakers were tripped. Of course I am new to these systems. I have no idea what the problem is so any enlightenment would be much appreciated.

    • Hi Noel,
      It is likely a circuit breaker or GFCI that has been tripped. That would explain why both are not working. Check those and let me know if you find anything.

      Brian a.k.a. RD600 RainDial Doctor

  8. I had a power outage for 24 hours. My Rain Maker worked after this, however, it was the wrong time of day, so I turned it off during the cycle. Display was blinking so I reprogrammed the unit. After programming and when I moved the set programs button to run or manual, it won’t start at all. What can be wrong. This never happened before.

    • Hi Shirley,

      If (no matter what valve you try to turn on) it just goes back to “OFF” or blinks or acts strangely on the display, it just needs repairing. I do them often and would appreciate your business if you’re willing. If it only happens with One valve, then the valve solenoid is probably bad and needs replacing, but I’d doubt that based on your description.

      If the timer seems to be working (I couldn’t tell from your message) but the water isn’t coming on, let me know and I’ll guide you through the other troubleshooting steps to figure it out.

      You can email me at if you have other questions.


  9. My Rain Dial is blank in the window where it should show the time or other functions. I changed the 9 volt battery, but that didn’t help. I tried unplugging it inside the box and plugging it back in, but that also did no good.

    • Hi Valorie,

      What model number is shown near the Semi-Auto button in the lower left corner of your timer, and what brand is it – either Irritrol or Hardie).

      Then I can help more.

  10. I have a rain sensor, but I don’t think it is working properly. It flashes SEn but there has been no rain. I looked inside the unit and notice that there is an orange wire that is not connected. Any idea where that might go?

    • Hi Mike, I don’t think the wire is the issue, it’s likely a problem we repair. I’d send the backboard and timer in for repair. It’s pretty common to have some extra, unconnected wires because the wire bundles have a set number of wires in them and they don’t all get used based on how many valves you nave.

      If you want, you can send me a photo of the wiring and I can take a look. send it to

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