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’ stands for Fuse.  If you see a 5 (FU5), the 5 represents an S.

This page explains:

  1. What the FUS message really means
  2. How to clear the message
  3. How to determine what is causing the FUS message.
  4. How to fix the FUS message

1. Bottom Line First: This is important to know about the RD600 irrigation timers

  • Despite the RD600 message saying FUS, this does not mean the fuse is bad as one would expect.
  • The FUS message is almost always caused by a shorted solenoid or wiring, not a fuse…).  Solenoids are the cylindrical electrical ‘switch’ that are screwed on the top of the valve; they have two wires going to it. They are fairly easy to replace.
  • although it is not related to the fuse message, you can read about checking the fuse here.
  • In rare cases with the -R series, a full reset resolves the problem.  All the information you need to know is below.

2. To clear the FUS message:

  • 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 figure out what valve is causing the problem and how to fix it:

What valve is causing the FUS message?

  1. If the fuse is good and the message comes back
    1. the suspected “problem valve” number will be displayed on the top of the LCD screen with the FUS message.
    2. Try removing the wire on the terminal board 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, including the MC/Pump wire if you have one.  Clear the message, and run the schedule without the valves connected.
    3. Reconnect the valve wires one by one until you find out which one causes the error to re-appear; this is your suspected bad solenoid.
    4. If you think you have a bad solenoid, you can go to this page for more information: Testing and Replacing Valve Solenoids
    5. 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…
    6. If the RainDial timer shows the FUS message with all valve numbers that you are using, it’s likely a problem with whatever is connected to the Pump/Master-valve (MV) screw terminal.  This is because the pump is activated for all valves, so if it is failing, every valve will detect an over-current condition and active the FUS error.  All RD-600 series timers have a MV/Pump terminal on the back terminal board.   You can try clearing the FUS message and then remove the wire to this terminal.  Then run the timer to see if the FUS message still appears.  Of course the water won’t flow very much because the pump is off, but if no FUS message occurs, you know that whatever is connected to the MV/Pump terminal is likely causing the problem. You can disconnect the wire to that terminal and measure the resistance between the wire (not the terminal) and the VC terminal. A typical valve solenoid is 27ohms of DC resistance or more.  If you measure significantly less, it’s likely bad.   Check the specification on your pump/master-valve relay to determine if the resistance is too low or not, or try replacing it.
    7. 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.
    8. 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:

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

  1. Hello,
    I’m seeing a FUS error message with number 2 above so I’m guessing it is the #2 valve. I’ve tried clearing message to no avail. Next, I did successful factory reset but after reprogram am still seeing the FUS 2 message.
    Your instructions say to disconnect the corresponding wire and then reconnect. Do I leave unit plugged in to do that?
    Thank you, Janye

    • If you’re working with wires on the back terminal board, it’s all low-voltage, which is not hazardous. You just wanna make sure you don’t cross any wires that might short out and damage the transformer. So if you want to turn off the breaker or unplug the unit while you are making changes, it would be good practice to do so.

      You want to put a good 9 V battery in the unit so that your programming is saved when you turn off the power.

      Hopefully That helps,

  2. Hi Brian,

    I have the RD-900 everything was working as per normal until this morning. When i checked the controller FUS was flashing with station 1, i removed station one and tried clearing the error as per your instructions but this had no effect and all stations now appeared with the error..
    I also tried factory resetting as per your instructions but nothing happened and the FUS error still reports All Stations.
    Do i need to remove all wires to clear the FUS error? I also MVPump connected. I’ve tried removing this wire also and retrying the steps but again nothing changes. I’ve disconnected the batter, wires, the controller from the board but nothing stop FUS with all stations from flashing.
    Any help is appreciated

    • Hi Brendon,
      You should be able to clear the message, at least until the timer tries to turn on again. Make sure the dial is in the current time setting and press the plus or minus button.

      If you’re seeing all the valves caused the issue, it’s usually due to, the pump solenoid starting to short out. You can try some experimenting by leaving the pump disconnected after you clear the message. Then try turning on the valve. Obviously, you won’t have enough water pressure to make things work, but it will give you a pretty good indication that the pump is causing the problem.

      Let me know how it goes . Thanks,

  3. I have a rd 900 the fuss comes on station 5 and 6 but station 1 doesn’t come on manual works tried replacing the fuse still not working station 1 doesn’t work all other stations work need help do I need to replace the clock

    • I’d suggest doing a factory reset, if that doesn’t work, send it in for repair. Usually the fuse msg is due to a faulty solenoid. If u have a multimeter, there are measurements that can be done to help solve the issue. Let me know.

      I suspect there may be a couple of issues, all very solvable and a new clock wouldn’t necessarily fix them all.

  4. Several times you say to do something and then “clear the message” and try again. But you don’t say what to do to “clear the message” before trying again. No matter what I do the FUS and valve numbers I tried to operate manually continue to appear in the window. I only have two valves on this timer and yet when I manually cued 3,4,5 stations, which do not have valves, their numbers were added to the FUS message.

    • Hi Anthony,

      Make sure the timer is not currently running or the fus error could immediately get set again.
      If you follow the steps to clear the message and it doesn’t clear, then it could be something wrong with the timer (e.g., button or switch settings not being detected properly or they have failed.)

      Do you have anything connected to the MV/Pump screw terminal? That terminal is activated every time you turn on any valve, so it could be the problem. Let me know.

  5. Hey guys
    I have a type R 9 zone
    Ran it yesterday and zone 1 ran and then the FUS error popped up. I disconnected all wires and did a factory reset but am still getting the FUS error….please help

    • Hi JD,

      that’s strange behavior. What number(s) (if any) show up on the top row of the display when you see the FUS message?
      Also, do you have a pump or master valve or other wire connected to the PMP/MV terminal on the back terminal board?

      • Mine is doing the same thing. I attempted to replace with a new controller that says FUS on every station. Yet I have an older RD-1200-R panel that works fine on all stations when I swap it with the new panel. Makes no sense. I have a MV wire connected if that makes a difference.

  6. My RD 900 has the plus button stuck in and doesn’t see seem to come out all the way, Is there a way to open the controller to see if something is broken or out of alignment?

    • Hi Daryl,

      You can try to open it yourself with a flathead screwdriver or you can send it in for repair. We can fix the button and make additional adjustments to the timer to help ensure it will continue working for a long time. I’ll send you an email with our standard repair details in case you’re interested.


      Meghan – RainDial Doctor in Training

  7. I disconnected all the wires from my valves. I removed the 9V battery. I cut power to the timer. Yet when I power it back on I still get the flashing FUS. None of the wires from the sprinkler valves are connected.

    • Hi Alex,

      some questions:

      Do you have the “-R” model?
      Do you have any wire connected to the MV/Pump terminal. If so, try removing that one.
      Try clearing the FUS message first, then connect one wire at a time.


      • Hi Brian sorry to come in on the conversation but I’m having the exact same problem. I disconnected from the pump terminal and everything stayed on. Once I reconnected I had the error message again.

        • Hi John,

          Try doing the Factory reset per the DIY Troubleshooting page and see if that help. If not, it’s possible that the timer is failing and needs replacement. I’d like to help, but I suspect from your email address you’re in Australia so repair options from me will be limited …

  8. I know this is kind of a crazy question but…..I live in Payson, Arizona and have problems with rodents eating my solenoid wires. I have heard it said the wire in these cases untilze peanut oil in their makeup thusly get eaten. This problem happens up here to wiring harnesses on cars as well. Any wire out there that repel these rodents? Some of the farther runs of wire I have encased in PVC but the short wires to the “hot” and “valve” can’t be encased as such. Thanks.

    • Hi Douglas,

      That’s a really good question that I unfortunately don’t have a good answer for. You might try searching google for solutions to the car problem since it’s a little more common. If you could let me know what you find out, I’d appreciate it.

      Anyone else have a comment or suggestion?


      • Sprinkle the inside of your valve box with “Cayenne Pepper” you can also do this around the wheels of your vehicle. Stuff is so strong there won’t be ANY critters crossing it’s path.

  9. All valves work in manual mode. The fuse message comes on in automatic mode. Station 1 runs, then it goes to station 12 and runs. All stations are listed under the fuse message

    • Hi Jeff,

      If you have a -R model, do a factory reset and reprogram. Usually it’s a solenoid problem that causes the fuse message. If you have a multimeter and can check the resistance, that’s worth doing too.
      Let me know if that helps or not and we can try some morechecks.


  10. Hi
    I only get my FU5 fualt appear in the morning.
    At night I can rub my system full a through test cycle. In the morning I try again but this fault comes up.
    I’ve ran all the systems solo and they work. It’s a weird one, if there was a solenoid failed I would have assumed it would never work.

    • Hi Jesse,

      That’s odd behavior, for sure. I suspect that there is a solenoid that is ‘marginal’ and maybe the temperature variation from morning to other times is making it change just enough to fail. Other ideas/questions below:

      The FUS message should also indicate what valve number is failing. Is it always the same number (see the top row of the display when the FUS msg is visible.) If so, try swapping the valve wires and see if it ‘follows’ a particular solenoid. If it does, replace it.

      Let me know and we’ll troubleshoot it more,

  11. I replaced both of the heads on my irritrol valves. Bought new valves and changed the heads. I initially had a bad solenoid on one of the valves so I just changed both because they were both 15 years old . Instillation problem was FUS and this cleared up after valve change . The problem now is the valve comes on and the controller pulses just as it did before I changed the valves. Does this mean the controller is toast or will resetting it take care of the problem?
    Than you for your help.

    • Hi Rick,

      That’s a symptom that indicates the timer is starting to fail. The good news is that it’s something I repair often, and you won’t have any more trouble with it for many years to come. I’ll send a separate email with details, but you can get most of what you need from the ‘how to get it repaired’ menu.

      Thanks for posting,

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