4 Common Sprinkler Head Problems

To keep your sprinkler system working properly you must keep your sprinkler heads clean and free of debris.

Problem 1: Clogged Sprinkler Heads
Clogged sprinkler heads are probably the most common problem you will run into with your underground sprinkler systems. Cuttings from your lawn mover and debris from rain storms can eventually block a sprinkler head. 

The fact that sprinklers spray pressurized water out the holes doesn't mean that the splinkler head is automatically self-cleaning. Fortunately, it's easy to clean sprinkler heads:

1. Have a look at the head and if it appears clogged, use a piece of stiff wire to clear the hole.
2. For a thoroughly dirty head, lift it from the sleeve, unscrew it, soak and clean with wire. Flush with running water.
3. Be sure and clean out the sleeve before replacing the head.

Problem 2: Broken Sprinkler Heads

Even though many sprinkler heads are designed to pop up when the system turns on and to retract when it stops, sprinkler heads are often struck by mower blades or edging tools. Replacing a sprinkler head is easy; simply unscrew the head or stem, remove it, and screw in a replacement.

Problem 3: Sprinklers Are Too High

When the sprinkler head sits too high on the ground it is vulnerable to damage.This is the most common reason for broken sprinkler heads. This problem can be remedied by lowering the heads deeper into the ground. Cut about a foot square around the head with a shovel and remove the sod or the top layer of grass and soil carefully. Then use a hand trowel to dig carefully around the head. Move slowly and don't use too much pressure or you could cut through the water pipe. Dig deep enough that so that the top of your sprinkler heads sit only 1/2 inch above ground level. Once you've dug deep enough and have the head lowered, carefully pack the dirt back around it and replace the topsoil.

You might think it would be best to go lower than ground level to avoid lawnmower blades and other hazards. While lower placement would probably prevent broken sprinkler heads, they would become clogged more easily with dirt and grass debris.

Problem 4: Stuck Valves

You'll know when a valve is stuck because your sprinklers will continue running after they're supposed to shut off. Home sprinkler systems often have two valves—one at each end. Most likely a chunk of debris or small rock is blocking the valve from closing and shutting off the water flow. Check both valves for this problem. Unscrew the solenoid and let some water run through and then screw it back on. If that didn't solve the problem, you may need to turn off the water and use a screwdriver to remove the valve top and manually scrape out the bloackage.