So, mount the timer and secure it in place. You’ll have to grab a drill and drill new holes if you have a different timer. This is where using the exact same timer helps. Next, grab your new timer and slide it onto the screws you left on the wall. Once you have the screws loosened, you can lift off the old timer. ![]() In most cases, the top two screws can stay in place as the timer will lift off with them in place. Then, use a screwdriver to loosen the screws holding the panel to the wall. Next, remove the wires from the panel, making a note of which wire goes where. Then, open the main timer cover and the control panel. First, remove the plug from the power outlet. Also, If you have a hard-wired system without a removable plug, I recommend contacting an electrician.įor a plug-in timer, here’s what you need to do. This means you’re not going to have to get the drill out. If you want to keep the work to a minimum, then I recommend you replace your old timer with exactly the same model. To fix this, you’re going to need to replace the timer. If you discover that your irrigation timer won’t turn off, then your sprinkler zone won’t turn off. If so, here’s how you can fix the problem. I hope you were able to use the causes above to find out why your irrigation is not shutting off. How to Fix a Sprinkler System that Won’t Shut Off (3 Things to Try) This could be why your sprinkler valve won’t shut off. Once you are in the valve, look for any trash or damage to the diaphragm. Then, remove the screws on the top of the valve and expose the diaphragm. So, turn the main water off and grab a screwdriver. You could have an obstruction if you can’t start or stop the water flow. So, twist this screw and see what the valve does. Valves like Rain Bird have a small thumb screw that you can turn to manually open and close the valve without a solenoid. ![]() So, depending on what type of valve you have, you’ll have to diagnose it. However, any trash in the water can become lodged in the diaphragm and prevent it from switching off. Once the solenoid is activated, it allows water pressure to move the diaphragm and open the valve. Inside the irrigation valve, there is a small diaphragm that tells the valve to either open or close. An Obstructed or Damaged Irrigation System Valve If it’s jammed or stiff, it may not be retracting when the power is cut. If this doesn’t happen, then the solenoid is faulty.Īnother test you can do with the solenoid is to test how the pin moves by just pulling and pushing it. The solenoid center pin should extend from the solenoid with power, then retract when the system is switched off. Next, turn on the zone you connected the solenoid to and check what happens. One wire will need to go to the COM connection and the other to one of the numbered zone connections. So, remove the solenoid from the valve and take it to your irrigation timer and connect the two wires. You can do this by wiring the solenoid directly into the timer. To check if a solenoid is working or not, you need to give it power and check if it activates. Also, you’ll need to replace the timer if the dials or switches aren’t working and are not turning the power to the solenoid off. The timer is defective if you turn the system on and off, and a voltage is always present. You shouldn’t have any voltage when the system is off. To do this, connect the negative side of the multimeter to the common/ground of the zone power and the positive side to the problematic zone number. So, if you grab a multimeter, you can troubleshoot the timer. This meant I couldn’t switch the system on or off, no matter what I did. ![]() ![]() I’ve also had Rain Bird and Orbit irrigation timers go bad where the rotary switch fails. It’s common for irrigation timers to stick on and not be able to kill the power to the valve solenoids. Don’t worry, if you’re handy with a few basic tools, you should have no trouble figuring out why the irrigation won’t stop running. So, if your sprinkler system won’t turn off, you’ll need to conduct troubleshooting tests. Possible Causes of a Sprinkler System That Won’t Stop Running This can include a timer that will not stop power from going to the solenoids, a valve solenoid not being able to retract and close the valve, or an obstructed/defective valve keeping one of your irrigation zones open and water flowing. Your sprinkler system won’t turn off because there is a problem with either the irrigation system’s valve manifold or the timer. 3.3 Keep the Solenoids Dry Why Your Sprinklers Won’t Turn Off (The Short Explanation)
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