How do you clear the FUS or FU5 message?

(All information here is copyrighted by Brian Keller, 2012).

If this troubleshooting information doesn’t help solve the issue and you’d like to have it repaired, please send it to us.  We repair all models of RainDial timers.

The Irritrol RD-600 series sprinkler controller message ‘FUS’ stand for Fuse.  If you see a 5 (FU5), the 5 represents an S.

Bottom Line First: This is important to know about the RD600 irrigation timers
You can clear the message and see if it returns.   If it doesn’t go away.  It’s almost always caused by a shorted solenoid or wiring, not a fuse…) Solenoids are the electrical ‘switch’ on top of the valve that can be easily replaced.  The rest of the valve is usually still good.  In rare cases with the -R series, a full reset resolves the problem.  All the information you need to know is below.

General overview: The information below can help isolate the problem to being an issue with a valve.  Definitely use the this troubleshooting information below to help determine if a valve(s) seems to be the problem.  If it’s not, just send it in for repair; we’re happy to help, but this is usually not caused by a timer problem.

Set the dial to the Current Time position, press the + or – button
If the FUS error won’t clear, perform steps to do a factory reset
(try both old and newer timer reset sequences)

If the FUS error clears, but keeps coming back, the following information will help you diagnose and fix it:

Try clearing the FUS message using the instructions below and see if it comes back. (Set the dial to the Current Time position, press the + or – button.)

  1. Despite the RD600 message, this does not mean the fuse is bad as you would expect.  If you still want to, here’s a link on how.  Not all back terminal boards have fuses, so don’t worry if you don’t see one, it’s normal based on the age of the timer.
  2. If the fuse is good and the message comes back
    1. the suspected “problem valve” number will show up in the top of the LCD screen when the FUS message is displayed.
    2. Try removing the wire for that valve number, clear the message and run the schedule again.
      1. If you have multiple numbers appearing, remove the wire for each of them, clear the message, and run the schedule without the valves connected.
    3. If the FUS message does not return with the wires disconnected, it’s likely a solenoid or valve wiring problem.  Reconnect the valve wires one by one until you find out which one causes the error to appear; this is your suspected bad solenoid.
      Once identified, try swapping around the bad valve wires to another terminal and see if the problem “follows” the valve wire.  This will help confirm which one is bad. (The valve number shown with the FUS error will follow where you put that valve’s wire), If it follows the valve, check wiring and/or replace the solenoid.

      1. Solenoids are usually easy to replace, just turn the water off, disconnect the wires, unscrew the solenoid and replace it.
      2. You can get them from your local landscape supply store (E.g, SprinklerWorld, or other, but probably not HomeDepot or Lowes).
      3. If you want to pickup the parts first, take a picture of the valve to the store with you.
    4. If the RD600 series FUS message returns with the same valve number even if you moved the valve to a new location, it’s unlikely that you’d have two solenoids fail at the same time so check the wiring for damage due to recent digging by people or pets, etc… Next, try removing all the valve wires at the terminal board, including the MC/Pump wire if you have one, then clear the message.  Repeat your testing.  If no FUS message appears, re-connect one wire at a time until you see the FUS message; that will indicate the bad valve.
    5. If the message continuously re-appears and you see multiple valves listed in the display, and you have a connection to MC/Pump, the it’s likely the MC/Pump solenoid or relay has gone bad.  The Pump typically turns on whenever any station/valve is on, so if the pump circuit is bad, it will make every valve look bad.
    6. You can test if the solenoids are bad if you have a meter capable of measuring resistance.  Simply turn off all the valves and measure between the VC/Vcom terminal and the valve/station terminal (e.g., between VC and 1)  every valve including the MC to VC/Vcom should measure around 20 to 40 ohms.   If infinite ohms, you have a broken wire or bad solenoid that results in an open circuit and looks like it’s missing. If you have lower resistance, it’s likely that the solenoid has started to short out and is failing, or your wires are crossed and touching somewhere.  See this post for more information on testing.
    7. If the message appears with no valves or MC/Pump wires connected, try doing a full factory reset (use both the older reset method and newer (-R series) reset methods.  If no luck, it’s still very unlikely to be problem with the controller but if you’re convinced it could be, contact us here.

Other troubleshooting ideas: If the valves are the same, you can swap solenoids with a known working valve and see if the problem follows the suspected bad solenoid.

You can also disconnect the bad solenoid and clear the message.  If you do this, the timer will work normally except for the one valve that was disconnected.

If we’ve helped solve the problem and deserve a little credit, please leave us a donation, we’d really appreciate it. 

For full RD600 series controller reset:
Older models can be reset by removing the battery and power from the controller – this may reset programming. Always try this method first, then the full factory default reset sequence.  All the details can be found in this DIY page:

40 thoughts on “How do you clear the FUS or FU5 message?

  1. Hello. Where can I find the “MC/Pump solenoid”? My system has the FUSE message and all 4 zones listed.

    Thank you,

    • Hi Skip,
      If you have one, there will be a wire connected to the MC/Pump screw terminal of the back terminal board.
      The pump will be connected to the other end of the wire.

      Do you have a wire on that terminal?


    • Hi Al,

      If you watch it, does it change from F05 to F04…. over time? If so, the F is really an A and it means it’s currently running schedule A and has 5 minutes left for that particular valve to run.

      I’m sure I can repair that sprinkler timer if you’d like to send it in, just use the contact us form.


  2. Hello Doc,
    I cant locate the fuse in the controller box? or is the fuse in the breaker box to the house? Also, do the nutrual ground wires have to go to all silanoids or are they in a relay set up, start with one, then they are tied through the rest of the sections? finally, what does an OPEN message mean?

    • Hi Dave,
      Thanks for the inquiry, I appreciate it. Not all backboards have fuses – some do, some don’t. This is normal. Are you getting the FUS message? OPEN means that a solenoid is broken or that the wiring to it is disconnected. I have a picture here on my DIY page of what typical wiring looks like.

      Let me know if you have any other questions,

      Brian – The RD600 Irritrol RainDial Doctor

    • Hi Tim,
      Thanks for posting this, I often don’t hear from people so you made my day!

      Brian – the RainDial Doctor

  3. Why doesn’t my RD600 turn ON anymore? The plug connected into the outlet feels warm to the touch, but no power is going to the box.

    • Hi Jesus,

      It’s strange that the plug would feel warm. Do you mean the transformer plug (the big black box that plugs in?) If so, that’s a good sign because the transformer is likely working. If you have an RD9600 – R, send the back terminal board and the timer for repair and I’ll have it back to you shortly.
      here’s a link.

  4. Thanks guys.
    Was as simple as changing the time.
    I’ve had more dramas with my system over the last 2 years then the entire back catalogue of those kardashian clowns.

  5. I have an RD600-Ext, it shows “Fuse” as an issue, but only get power when I have a new battery attached. Otherwise no power to the system. I have checked connection and GFCI and all are good. Any ideas?

    • Hi, thanks for posting.
      There’s a page on my site that talks about that fuse error in depth. Take a look there first. There’s a good chance that it just needs repairing, and I’d appreciate the business if you’d like us to fix it.
      I’ll send you a separate email with repair details.

  6. I have the same problem with my 900 (06) that Steve Krall had with his. I tried the usual steps and it won’t reset. I am thinking it is a failing controller. Where are you? I am in Tempe AZ so VERY hot.
    I have been away for 5 weeks taking care of my mom in another state and just got home. It looks like the 2nd station hasn’t been coming on or my husband killed the grass trying to kill spurge. In any case it the controller is doing exactly what Steve Krall described his was doing on June 10, 2017

    • Hi Carolyn,

      Sounds like Steve’s problem for sure. I’m in N. Phx. I’ll send you a separate email with all repair details. I’m home all weekend if you want to bring it by and run an errand or grab a bite to eat. Other options are to mail it, or maybe a quick exchange… Stay tuned for an email.

      Brian – aka the Irritrol RD600/900/1200 Rain Dial doctor

      • HI Brian, I ran through the steps again after replacing the fuse (very little evidence that it had blown) and it began working once again. I am certain that I will need your services when I am unable to solve the problem and I need a new controller.

        • Hi Carolyn,

          Keep my contact info handy; it’ common for it to be intermittent as it starts to fail. I’ll be here when you’re ready.

          I’m glad it’s working for now anyway, just keep a close eye on it.

    • I would suggest following the reset instructions on the website if it happens again or it starts behaving strangely then I would send it in for repair. It’s likely an indication that it just needs to be repaired.

  7. Hello female here! This means help loll. I am a renter and trying to help a situation between the landlord and property management. We have a gcfi that I see is not working and wonder if that can be the issue with the box. The landscaper said that the sundial timer is broken and he can fix it but wanted a hefty bill and it didn’t add up. I checked the fuse as the fus(5) message was up and it’s fine. I reset the landscaping fuse in the main breaker box also. Please help I would like to fix this because it’s arizona and the plants are dying! It’s 120 degrees help!

    • Hello back at ya. if the GFCI is powering the controller, it could be the problem. If the GFCI is constantly tripped and you know it’s tied to the controller then you’ll have to fix that first. To know for sure, it’ll take some more questioning.
      I’m only available for the next day or two, so if you’d like to give me a call you’re able to be in front of the timer it would help. 623-252-2949, preferably between 7-8 AM or 6-9pm. We’ll get it figured out.

      Before calling, let me know the model number that appears above or below the Semi-Auto button of the controller. It’ll probably be an RD600 or RD600-R.


  8. I have the Irritrol 900, (06)…Display indicates FUS and the current time, flashing between each…Also, when trying to run in manual, after inputting a time and depressing “MAN”, the display goes to “OFF”…this happens regardless of the valve selection.

    • Hi Steve, thanks for posting. The problem you described is a classic symptom of a failing controller. I’d be happy to repair it for you if you’d like. I’ll drop you an email with repair details.

      Brian – aka the RainDial doctor

        • I Carol. Send it in for repair, but before you do make sure to look at the info on this page if you haven’t done so already. Even if it clears the message now, keep an eye on it. If that message returns or you see things not watering when they should, just send it in.
          To clear the message: Set the dial to the Current Time position, press the + or – button
          Then try manually turning on each valve one at a time. If only one causes the message to re-appear, that valve is likely bad. If more than one causes the message to re-appear, send it in for repair.


    • Hi Martin,

      You may have to provide more details – do you mean each valve is turning on at the same time? (e.g., valves 1,2,3,4,5,& 6 of a 6 station all come on at once?)
      There’s a DIY Irritrol RainDial troubleshooting menu on this site –

      Start there and look under that page for info about when valves come on when the are not supposed to and see if that helps. If you don’t have any luck, give me some more details.


    • Hi Issam,
      I don’t see an opn error with a normal rainDial timer, do you have a RainDial “Plus” module?
      The “opn” message indicates that the connection between the timer and the valves or motor is not connected. It could be a problem in the wire connections, back connector/terminal board, or the timer. I recommend you temporarily shut off power and remove the battery from the timer to reset it. Then, try running a schedule again and notice which valve causes the “opn” or open message. If it happens with every valve, it could be the pump.

      Basically, try to figure out which valve is giving the open message, then check the wiring for that valve closely for a bad connection.

      If you cannot find a problem, you can follow the “Removal instructions” page and send me the controller and timer module for repair.

      Let me know what you find,

  9. Hi. I have an RD-600 controller (just replaced one that went bad after a number of years) and am getting the dreaded FUS message (FUS 5). I switched the wire for the bad circuit from 5 to 6 and now get FUS 6, so I don’t think it’s the controller. I replaced the solenoid on the valve that I’m pretty sure is the one at fault (it’s the drip irrigation valve, and all the others work fine) but that didn’t help – I still get the FUS 6 message. Is it likely to be bad wiring within the value itself? Thanks.

    • Hi Craig,

      It seems like you’ve been through the entire system by now. I’d agree with your assessment. The FUS problem is something I repair frequently; I’d suggest sending it in. I repair that problem and also replace other parts that frequently fail in the first 5-10 year so it’ll be better than new.
      If you’re interested, just send it in – the “How to get it repaired” menu option has all the details, or drop me a note using the contact form.

      thanks for posting,

    • Hi Tom,

      Look on the DIY page – you’ll see an item that mentions OFn or OF followed by a number. That’ll tell what the message means on the Irritrol RD600 series controllers and how to deal with it.

      Thanks for posting,

  10. Perfecto, amigo!

    Thanks for the pertinent and well-founded advice!

    One suggestion: Rain Dial should consider adding a “RESET” button!


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