Make sure the radius adjustment screw in the top of each nozzle is turned to the full open position.
Remove one of the nozzles. Most sprinklers have a screen installed under the nozzle. Remove the screen.
Look at the bottom of the nozzle. Is the small round inlet hole blocked?
If you found dirt in the screen or nozzle you should flush out the pipes again. 90% of the time this problem has been caused by dirt left in the pipes that then clogged the heads. See the next question for how to flush out the pipes.
Check for anything that could be blocking the flow through the sprinklers. Maybe they had a manufacturing problem. I’ve experienced this from time to time with almost every company’s products.A plastic mold gets out of adjustment at the factory and leaves a glob of plastic in the wrong place.
If you are using the little sprinklers that don’t have a retraction spring, this is normal. They pretty much stick up no matter what. You should replace them with a spring loaded pop-up with a pop-up height of at least 3″, I recommend you use a 4″ pop-up if possible. Now if you do have spring loaded pop-ups the problem is most likely caused by a small grain of sand, a stick, or something similar in the wiper seal. Here are a few things to try:
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Once in a while, you may need to replace your irrigation controller clock. This is not a difficult job, but it require some basic knowledge of wiring and some planning. First, make sure that your new controller is fully compatible with your irrigation system. Some things to check for: Does the new controller have the same number (or more) zones? Does the new controller utilize the same power source or is it battery operated? Can the new controller be mounted in the same place as the old controller? Before disconnecting all the wires from your old controller it is a good idea to label the wires with masking tape or wire labels. This will reduce confusion when hooking up the new clock. To avoid a shock be sure to unplug the old controller before you begin removing any wires. Read the instructions for your new controller before starting. It is often easiest to hook up the new controller as you remove wires from the old controller. This reduces the likelihood of confusing zone wires. Once the new controller has been fully wired, detach the old controller from the wall and mount the new one. Test all zones in your system with the new controller to ensure it is working properly.
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