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. RD-600 Series: Rain Dial Sprinkler/irrigation valves chatter or buzz or water pressure seems low.
  2. RD-600 Series: Display says FUS or FU5 and a number
  3. RD-600 Series: Display shows 5En or SEn
  4. RD-600 Series: Display shows OF1 or OF… some number
  5. RD-600 Series: Display shows P:On or P:Off
  6. RD-600 Series: Display shows OFF or blinks when turning on a valve manually
  7. Display is blinking – see above
  8. RD-600 Series: Time is frozen or cannot change the time
  9. RD-600 Series: Valves do not come on when they’re supposed to
  10. RD-600 Series: Determine if the valves are good
  11. RD-600 Series: Valve won’t turn off or come on when they’re not supposed to
  12. RD-600 Series: Valves will not shut off
  13. RD-600 Series: The case door won’t open or you lost your key 
  14. RD-600 Series: 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 …” sprinkler timer related topics below

  1. RD-600 Series: How to check the fuse
  2. RD-600 Series: How to test the transformer to know if the transformer is bad
  3. RD-600 Series: How to test if the valves or solenoids are bad.
  4. RD-600 Series: How to reset the RainDial controller and set it to factory defaults
  5. RD-600 900 1200: Programming tutorial
  6. RD-600 Series: Programming worksheet
  7. RD-600 Series: Typical Sprinkler Valve Wiring Diagram
  8. RD-600 Series: Rain Sensor information for Irritrol RD600 and other timers 
  9. How do I water while my timer is being repaired?

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?


200 thoughts on “DIY Troubleshooting

  1. Hello

    My older rd1200 wont display am timr, only pm. I have tried the instructions for resetting several times. Including the -r reset. But these did not help.

    I thought i found a reference to this problem a few days ago but havent found it since

    Would appreciate your help


    • Hi John,

      It’s possible that the LCD ‘segment’ that makes the little ‘leg’ on the A character in AM is not functioning properly. It probably is still doing am and pm, but you can’t tell which one you’re in at the time.

      You could try disassembling it and putting it back together, otherwise I’d suggest sending it in for repair. I can look at that as well as replace some other parts that often fail, that way you’ll be good to go for many many years.

      Let me know what you decide to do,

  2. The turn dial on my RD1200-EXT has broken off. Is it possible to replace the turn dial or do I need to replace the whole controller. Thank you.

    • You can send it in for repair and we’ll do the dial as well as update other parts that often fail; that way you’ll know I’ll be working well for a long time.

  3. I recently reprogramed my RD600r and changed some days to be “off” but yet the systems still come “on” the days that have been reprogramed. It’s as if the timer is stuck in the previous settings. I have disconnected the terminal from the power and re connected but no change.

    • Hi David,

      I’d suggest following the steps to set it back to factory defaults. Be sure to follow the -R version. If you can’t get it to clear out the previous programming, you can send it in for repair. This sort of problem is almost always corrected by the reset, but sometimes there’s a problem with the program switch or something else that puts it in program mode.

      Brian – aka the RD600 series Irritrol RainDial repair guy

  4. My RainDial will start on the timer but will shut off. I think it happens when it is switching to the next zone. The timer then flashes again.


    • Hi Keith,
      Thanks for the inquiry, I appreciate it. If it only happens with one zone, then it is likely a solenoid problem. If it happens with several zones, then it is a timer problem. Go ahead and send it in if you find out that the controller is the source of the issue.

      Brian – The RainDial Doctor

  5. I have the 9 station Rain Dial Irritrol.
    Program is not turning on valve when scheduled. I can turn on the valve but putting time on and pressing manual.

    It is not holding the program. Leave for a day and check the setting and the set times and watering times have changed. I put in new battery and reprogrammed again.

    • Hi Kathy,

      I thought I had already responded… I’d suggest sending it in for repair; the problem you describe is something that I see and repair frequently.

      If you have other questions, email me at


  6. My rain dial control box has started to beep. It is an intermittent 3 short beeps.
    Please tell me what is causing this and how I can fix it.

    • Hi Sammy,

      As far as I know, they shouldn’t beep. Is it possible the noise is originating from the valves? Sometimes when the rain dial’s start to fail, they’ll cause a buzzing or chattering sound in the valve box.

      Let me know if that seems to be the case,

  7. Just moved into home w rd1200. No instructions. But set it up like your video…keep getting”of1” flashing w current time. So nothing is kicking in when the set time is programmed. Please help. Must be that ‘OF 1’…?
    Manual works fine. Thank you…bruce

    • Hi Bruce,

      The RD1200 OF1 message and solution can be found on my DIY page, take a look and let me know either way if that helps.

      Regards, Brian – the rd600 rd900 and rd1200 repair ‘doc’

  8. I am not getting any digital reading and nothing is working. I have changed the fuse, the battery, and the electricity outlet is working. It just doesn’t do anything though once in a while it will turn on, then nothing.

    • Hi John,
      Not sure how this comment fell through the cracks. If you still need help, that sounds like the problem we typically repair. Please send in both parts (controller and back connector board). I will send you an email with repair details.

      Meghan – RainDial Doctor in Training

  9. I try to set unit to run by valve settings, but no matter what valve I set it to, it always runs on valve #1. I currently use 5 valve settings. What does that tell you I need to fix, or have repaired?

    • Hi James, It sounds like a programming issue, or possibly your # 1 valve is starting to fail, but I’d check programming first.
      Do a full rd600 series reset to clear out everything but the default program, which is schedule A programmed for every valve for 10 minutes, every day at 7am. You’ll have to turn off the parts of this default schedule you don’t need.

      Let me know how it goes.
      Brian – aka the RainDial Doctor for RD600, rd900 and rd1200 series controllers.

  10. RD 1200– Have to turn water supply valve on manually. System seems to work ok then, but I have to turn the valve off manually. Can you advise

    • Hi Bob,
      Are you manually turning it on at the valve or at the timer? When you turn it on with the timer, does the timer indicate that it is turning on a valve (for example, something like M:01 or A:10, etc)? Let me know.

      Brian – The Irritrol RD600 RainDial Doctor

  11. The unit does not seem to have power. I have checked the electrical outlet , replaced the 9v battery and the 2A fuse. There is still no data on the screen. Is there anything else I can check to make the unit turn on. I used the irrigation system 3 days ago. We have not had any electrical issues at my house and the weather has been 100 degrees with no rain.

    • Hi Madeline,
      Thanks for the question. I would recommend trying a full reset. I have instructions on how to reset on my website here.

      Hope that helps! Let us know.

      Meghan – Irritrol RainDial Doctor in Training

  12. Good afternoon: My RD-900 control has 27 volts input but the output to the water valve solenoids hunts between 27 and 14 volts. If I bypass the control and supply 27 volts to the solenoid then the zone turns on and works. I suspect the control is not playing fair?

    • Hi Steve,
      Sorry for the delayed response – if you still need help, that sounds like the problem I typically fix. Go ahead and send it in for repair. I will email you with detailed repair instructions.

      Brian – The RainDial Doctor

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