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Diagnostic Helper

Sprinkler Troubleshooter

Pick the symptom you're noticing below. You'll get immediate answers with likely causes, safe checks you can do yourself right now, and when it's time to call Chris. No email or form required to see the diagnosis.

Diagnosis for:

Zone won't turn on

One specific section of your yard remains dry when the controller triggers that zone.

Likely Causes

  • Disconnected or cut 24-volt field wire between the controller and the zone valve.
  • Burnt-out solenoid coil on the in-ground valve.
  • Stuck valve diaphragm or clogged pilot port inside the valve bonnet.
  • Loose common (white) wire connection inside the valve box.

Safe Checks to Try

  • Open your in-ground valve box and locate the zone valve. Turn the solenoid (the black cylinder with two wires) a quarter-turn counter-clockwise to see if the zone turns on manually. If it turns on, the plumbing is fine and the issue is electrical.
  • Check the terminal strip at the controller to ensure the zone wire and common wire have not slipped out of their screws.

When to Call Chris:

Call Chris if turning the solenoid manually does not turn the zone on, if your multimeter shows no resistance (ohms) across the zone wire, or if wiring in the box is corroded and needs rewiring.

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Complete Diagnostic Guide

Frequently Encountered Lawn Sprinkler Problems

Below is the full troubleshooting guide documented for homeowners across Sevier and Knox counties.

Zone won't turn on

One specific section of your yard remains dry when the controller triggers that zone.

Common Causes:
  • Disconnected or cut 24-volt field wire between the controller and the zone valve.
  • Burnt-out solenoid coil on the in-ground valve.
  • Stuck valve diaphragm or clogged pilot port inside the valve bonnet.
  • Loose common (white) wire connection inside the valve box.
Homeowner Safe Checks:
  • Open your in-ground valve box and locate the zone valve. Turn the solenoid (the black cylinder with two wires) a quarter-turn counter-clockwise to see if the zone turns on manually. If it turns on, the plumbing is fine and the issue is electrical.
  • Check the terminal strip at the controller to ensure the zone wire and common wire have not slipped out of their screws.
When to call Chris: Call Chris if turning the solenoid manually does not turn the zone on, if your multimeter shows no resistance (ohms) across the zone wire, or if wiring in the box is corroded and needs rewiring.

Head won't pop up

A spray head or rotary nozzle fails to rise above the grass line, or stays stuck halfway.

Common Causes:
  • Sand, grit, or mower debris packed tightly into the rubber wiper seal.
  • Cracked internal riser retraction spring.
  • Mower tires or heavy foot traffic pinched or cracked the flexible funny-pipe under the head.
  • Underground pressure drop preventing full extension of all heads in the zone.
Homeowner Safe Checks:
  • While the zone is running, gently grasp the nozzle and pull it up by hand. If it sprays normally once lifted, the wiper seal or spring is worn out.
  • Unscrew the nozzle and rinse the plastic filter screen under running water to clear fine sand or silt.
When to call Chris: Call Chris if water boils out of the ground around the base of the head when running, or if the head refuses to retract after mowing.

Soggy or muddy spot

A section of lawn remains saturated, squishy, or pooling water even on days when the system did not run.

Common Causes:
  • Low-head drainage: water in the higher pipes naturally drains out through the lowest head on the slope after a cycle.
  • Weeping valve: a worn rubber diaphragm or piece of sand prevents the valve from seating 100% shut, allowing water to trickle continuously.
  • Cracked main line or lateral line joint under constant pressure.
Homeowner Safe Checks:
  • Check your city water meter while all household water and irrigation are shut off. If the small red triangle or low-flow indicator is spinning, you have an active leak.
  • Notice if the wet spot is always around the lowest head on a downhill slope. If it dries out after 30 minutes, it is simple low-head drainage (which can be resolved with check valves).
When to call Chris: Call Chris immediately if the mud spot stays continuously wet 24/7, if water is bubbling through the turf, or if your water bill suddenly spikes.

Weak spray or low pressure

Sprinklers barely spit water, fail to reach full coverage, or don't cover their intended radius.

Common Causes:
  • Backflow preventer isolation valves partially closed after winter or maintenance.
  • Clogged fine-mesh filter screens at individual spray nozzles.
  • Underground lateral line crack or blow-out leaking water underground before it reaches the heads.
  • Pressure regulator valve (PRV) failure at the main supply.
Homeowner Safe Checks:
  • Inspect the backflow preventer outside. Both blue or yellow lever handles should be completely parallel with the bronze copper pipe.
  • Inspect the spray pattern of each head in the zone. If one area has an unusual bubbling puddle while the rest are weak, the leak is located right near that puddle.
When to call Chris: Call Chris if all heads in the zone are equally misting or weak and both shutoff valves are wide open, as underground pressure testing is needed.

Controller blank or not running

The timer display is dark, resets itself, or fails to advance through scheduled runtimes.

Common Causes:
  • Tripped GFCI electrical outlet in the garage, basement, or exterior panel.
  • Internal 0.75A or 1A glass fuse blown inside the controller cabinet due to an underground electrical short.
  • Active rain sensor holding the system in 'Rain Delay' mode after rainfall or a failing wireless sensor.
Homeowner Safe Checks:
  • Plug a small work light or phone charger into the outlet powering your controller to verify power is actually flowing to the wall receptacle.
  • Look for a 'Sensor Bypass' switch on your controller faceplate and flip it to 'Bypass'. If the schedule runs immediately, your rain sensor is either wet or faulty.
When to call Chris: Call Chris if the controller has power but gives an 'ERR' or 'Short' error code, or keeps blowing the internal fuse every time a specific zone tries to start.

Water running when it shouldn't

Sprinklers continue gushing water even after the programmed runtime has ended or the controller is turned OFF.

Common Causes:
  • Pebble, silt, or rust particle trapped inside the valve chamber beneath the rubber diaphragm.
  • Torn or fatigued valve diaphragm unable to balance hydraulic pressure.
  • Manual bleed screw or solenoid left in the 'open' position in the valve box.
  • Controller 'Stacking' multiple start times that repeat the full watering cycle back-to-back.
Homeowner Safe Checks:
  • Immediately turn the controller dial to OFF. If water continues flowing after 60 seconds, the issue is mechanical inside the in-ground valve, not electrical.
  • Locate your main irrigation shut-off valve (usually a brass ball valve near the backflow preventer) and turn the handle perpendicular to the pipe to stop water flow and prevent flooding.
When to call Chris: Call Chris right away once you have isolated the water. Chris can disassemble the problematic valve, clear the debris chamber, and install a fresh factory diaphragm.

Call or text Chris directly

(865) 806-4619

Mon-Fri 8 AM - 5 PM • You work directly with the owner

Tell Chris What's Going On

Tell Chris about your yard or system and he will follow up with you directly.

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Call or Text (865) 806-4619