Guide · Troubleshooting
Drip Irrigation Common Problems & Fixes
Almost every irrigation fault is one of four things — blockage, leaks, pressure loss, pump fault. This is the diagnosis for each: what it looks like, the usual cause, and the fix that goes to the cause instead of the symptom.
The four failure families
The families are the diagnosis's skeleton — every fault sorts into one of them, and knowing which one you have is half the repair, because the fix for the wrong diagnosis is a part that costs money and solves nothing. The sequence for each: the symptom, the cause check, the fix.
1. Blockage — the row that lags
What it looks like: the end rows lagging, the end emitters dry, the uneven wetting that gets worse over the season. The crop's tell is the size variation — the lagging row's fruit is the smaller one, and the market sees it before the farmer walks the line.
The cause check: nine times out of ten, the filtration — the filter undersized for the source, or the routine skipped. The rest: the sediment settled in the lines (the flush routine wasn't running), the feed's precipitate (the fertigation mix, the line not flushed after), or the single line's puncture that drew the sediment in.
The fix: the flush and the filter service first (the line cleaning guide walks it); the affected line section replaced where the blockage is established; the filtration fixed so the next season doesn't book the same clog. The filtration guide is the cause side — the right filter for the source, the cleaning calendar, the pressure-drop gauge that reads the drift before the row shows it.
2. Leaks — the soaked spot
What it looks like: the soaked spot where there shouldn't be water, the pressure dropping while the pump runs, the puddle at the fitting. The small weep is the quiet one — it's the leak that compounds, the joint that's wet in the morning and gone by noon.
The cause check: the fitting or the joint (the compression under-tightened, the seal worn, the cut at an angle), the line or the pipe (the puncture — the stone, the rodent, the foot), or the valve (the seat worn, the solenoid stuck). The design guide's as-built is the map that finds the point fast; the pressure-down test (the zone by zone, the pressure watched) is the sequence where the map isn't at hand.
The fix: the fitting or the line section replaced, the re-join to spec (the compression torqued, the seal seated, the cut square), the valve re-seated where the seat is the story. The repair service runs the same sequence — the diagnosis before the opening, the cause fixed, the repair tested at design pressure before the handover.
3. Pressure loss — the dry far end
What it looks like: the far end of the field dry while the head is fine, the pump running but the field starved, the "it used to reach" that's the whole complaint. The pressure at the head reads right; the pressure at the line end doesn't.
The cause check: the drop point is the cause — the check is the pressure at the head vs the line end (the design guide has the gauge points), and the sequence from the head to the dry end: the filter (the clog, the pressure-drop gauge's tell), the valve (the not-fully-open, the stuck solenoid), the joint upstream (the weep that's stealing the pressure), the regulator (the fouled, the wrong setting), the pump (the struggling, the seal's weep, the intake blockage), or the mainline (the undersized — the design's shortcut, the field that's always a little dry at the end).
The fix: the drop point's fix — the filter serviced, the valve re-seated, the regulator cleaned, the pump checked, the mainline upsized where the design was short. The honest line: where the drop is the undersized mainline, the repair is a partial fix and the upgrade is the complete one — the repair says which side you're on, with the numbers.
4. Pump fault — the pressure that's gone
What it looks like: no pressure, the cavitation noise (the gravel-in-the-pump sound), the tripping, the not-reaching-the-field. The pump is the system's heart, and its failures are the ones that stop the whole field.
The cause check: the dry-running (the source's level dropped, the intake blocked — the seal's wear from running dry is the classic), the worn impeller (the years' work, the seal's weep), the intake strainer (the blocked, the sediment's draw), the electrical (the tripping, the motor's wear), or the source itself (the borehole's yield dropped, the dam's level fell — the water quantity story, not the pump's fault).
The fix: the pump serviced (the seal, the impeller, the intake strainer), the cause found and fixed (the dry-run protection, the strainer's clean, the source's level noted), and the workshop service where the pump needs it. The repair is the visit; the maintenance calendar is what keeps the next fault from booking itself — the monthly pump check, the seasonal service, the intake strainer's clean.
The diagnosis, at a glance
| Family | The look | The usual cause | The fix |
|---|---|---|---|
| Blockage | The rows lagging, the end emitters dry, the uneven wetting | The filtration (9 of 10), the settled sediment, the feed's precipitate | The flush, the filter service, the line section replaced, the filtration fixed |
| Leak | The soaked spot, the pressure dropping, the water where there shouldn't be | The fitting, the joint, the punctured line or pipe | The pressure-down test zone by zone, the fitting/line section replaced, the re-join to spec |
| Pressure loss | The far end dry, the pump running but the field starved | The undersized mainline, the weeping joint, the clogged regulator or filter, the struggling pump | The pressure at head vs line end, the drop point found, the sized cause fixed |
| Pump fault | No pressure, the cavitation noise, the tripping, the not-reaching | The dry running, the worn impeller, the intake blockage, the electrical, the source's level | The pump serviced, the intake fixed, the source checked — and the cause found, not just the symptom |
What to tell the repairer — and what to check first
Before the visit, the five that diagnose most faults over a call: the symptom in your words ("the last row is dry", "the pump noise changed"), when it started and what changed around then (the rains, the harvest, the new crop), the system's age and roughly what's in it (the drip lines or the tape, the pump type, the water source), the pressure readings if the gauges are fitted, and the photos of the affected area. With those, a lot of the diagnosis is done before the wheels turn.
And the check that's the farmer's own: the maintenance routine — the filter's last service, the last flush, the last valve cycle. The fault that's the skipped routine is the one the calendar prevents, and the maintenance service is the keeping, on the calendar, with the report after each.
When the fault is the system
Some faults are the system's, not the component's: the mainline that's undersized for the field (the pressure loss that's the design's shortcut), the filter that was never fitted (the blockage that's the missing component), the pump that's the wrong scale (the struggle that's the spec's error). The repair finds the line between the component's fault and the system's, and says which side you're on — the repair quote fixes the fault, the upgrade quote fixes the system, and both come from the same diagnosis. The assessment is the visit that maps the system, so the next fault is faster to find.
FAQ
Common problem questions
Why are some rows of my field drier than others?
The blockage family — the end rows lagging is the slow clog's signature: the filtration drifted, the flush routine wasn't running, or the sediment settled in the lines. The check is the line cleaning guide's diagnosis (the end emitters first, the flush's water watched), and the fix is the flush, the filter service, and the filtration fixed so the next season doesn't book the same clog. The repair is the visit where it's found and fixed.
My pump runs but the far end of the field is dry — what's wrong?
The pressure loss family — the drop point is the cause. The check is the pressure at the head vs the line end (the design guide has the gauge points), and the sequence from the head to the dry end: the filter, the valve, the joint, the regulator, the pump, or the mainline (the undersized — the design's shortcut). The common problems guide walks the sequence; the repair is the visit.
What's the cavitation noise in my pump?
The pump's gravel-in-the-pump sound — the air in the water, the classic from the dry running (the source's level dropped, the intake blocked) or the intake strainer's blockage. The check is the intake (the strainer's clean, the level's position) and the seal (the dry-running's wear). The pump page covers the component; the repair is the visit where it's found and the cause fixed — not just the symptom.
How do I find a leak I can't see?
The pressure-down test, zone by zone: the zone closed, the pressure watched, the zone that drops the pressure is the leak's zone, and the walk of that zone (the fittings, the joints, the line) finds the point. The as-built map (the install's document) is the map that finds it fast; where the map isn't at hand, the test is the sequence. The common problems guide walks it; the repair is the visit.
How do I stop these problems from coming back?
The maintenance calendar — the filter's routine, the line's flush, the valve's cycle, the pump's check, the seasonal start-up and shutdown. The fault that's the skipped routine is the one the calendar prevents, and the maintenance service is the keeping, on the calendar, with the report after each. The assessment is where the calendar is built from the system's design and the water source.
Fault on the field
Describe the symptom and send photos — the diagnosis runs from the symptom, and the fix goes to the cause, not the part.