When you turn on a tap and nothing happens, a well pump that is not working is one of the most stressful failures a homeowner can deal with. There is no water for dishes, laundry, or flushing the toilet, and the silence where the pump should be is its own kind of alarm. The good news is that most “well pump not working” calls end up being fixable within the hour with basic electrical troubleshooting. In my 10 years of installing and servicing more than 1,000 residential well pump systems, I have found that roughly half of the pumps that stop working have not actually broken. The culprit is a tripped breaker, a dead contactor, or a failed capacitor, and the fix costs well under $150. In this 2026 guide I walk through the exact diagnostic sequence I use on every service call: the two-minute power check, the ten most common causes of a well pump not working ranked by frequency, a symptom-to-cause chart so you can identify the problem in minutes, and the safe way to test for 120 volts at the pump disconnect.
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By Thomas Reynolds, Pump Systems Engineer
Thomas has installed and serviced over 1,000 well pump systems for homeowners, from shallow jet pump setups to 400-foot submersibles, and specializes in diagnosing pump systems that will not start.
Published: November 2026
What this guide covers
The 2-Minute Power Check Before You Touch Anything
Before you diagnose a single component, run the five checks below. On the jobs we handle, about half of every “pump not working” call is resolved at the breaker panel or the disconnect box, and the other half at least narrows the fault to one side of the switch. Work top to bottom:
- Check the breaker in the main panel. The well pump is on its own breaker, usually 15, 20, or 30 amps, often labeled “well pump” or “pump.” If it is tripped or in the middle position, flip it fully off and back on. If it trips again the moment you restore power, stop there and read the locked-rotor section below. A breaker that keeps re-tripping is telling you the motor is drawing too much current, and every reset you attempt heats the windings further.
- Check every GFCI outlet in the basement and near the pump. A tripped GFCI upstream of the pump circuit, or a GFCI on the same phase that a power surfer has reset, will kill the pump silently. Press reset on every GFCI in the building.
- Check the pump disconnect box. Most systems have a small box with a switch or plug near the pressure tank that isolates the pump from its supply. Make sure it is in the on position and that its fuse, if it has one, is intact.
- Drop the system pressure. The pressure switch only sends a start signal when the tank pressure is below cut-in, typically 30 or 40 PSI. Open a faucet on the lowest floor and watch the gauge on the tank. If the needle is already above cut-in and the switch is healthy, the pump has nothing to start for.
- Confirm the well is not empty. After a long drought or heavy irrigation season the water level can drop below the intake, and a pump with nothing to move will either trip its overload or trip the breaker. If the well is suspected to be low, the pump should be left off and a well professional called before it runs again.
Field observation
When I log every “pump not working” call, the pattern is consistent: the motor itself is the least common cause. Breakers, disconnects, contactors, capacitors, and pressure switches account for the large majority of no-start faults. The motor is usually the last place the fault lives, and it is the most expensive place to find it.
10 Most Common Causes of a Well Pump Not Working
Once the power check is clean, the fault lives in one of the ten places below. I list them in the order I check them on a real system, which is also roughly the order of frequency based on our service logs.
1. Tripped Breaker or Blown Fuse
The most common cause of a well pump not working, and the first thing every technician checks. A breaker trips when the pump draws more current than the circuit can carry, which happens when the motor is locked, a winding is shorting, or a component upstream is failing. Reset it once. If it holds, run the system and listen: a healthy pump starts within a second of pressure dropping below cut-in. If the breaker trips again, do not keep resetting. A pump that trips on start is pulling locked-rotor current, and repeated restarts can burn windings that a single reset would have spared. If you are unsure what breaker size your circuit should be, our guide to breaker size for a well pump covers the sizing rules by pump amperage.
2. Tripped GFCI or Switched-Off Disconnect
Second most common, and easy to miss in the dark. The pump disconnect box is the isolation switch near the tank, and a guest, a painter, or a previous handyman can leave it off. GFCI outlets in basements and laundry rooms trip from humidity and age, and a tripped GFCI that feeds the pump panel section kills the circuit without a single visible sign. Check every one before you suspect the pump.
3. Failed Thermal Overload Protector
Most well pump contactors include a small thermal overload with a reset button, usually on the contactor face. It opens when the motor overheats from dry running, short cycling, or a locked rotor, and it stays open until it cools and is manually reset. If you press the reset, the pump starts, and the fault returns within minutes, the overload is doing its job and protecting a motor that has a real problem. A fatigued overload element also fails permanently, in which case the contactor needs a new overload or a new contactor. Replacement well pump thermal overload protectors are a modest fix that ends the cycle in most cases.
4. Dead or Pitted Contactor
The contactor is the 120-volt relay that switches power to the pump motor. Its contacts open and close every time the pump cycles, and after thousands of cycles they pit, weld, or burn out. A contactor with open, pitted contacts passes no current: the pressure switch calls for water, the coil clicks, and nothing reaches the motor. The fix is a like-for-like swap, matched to the coil voltage and amperage rating. Our complete guide to the well pump contactor shows how to read the ratings, test the contacts, and replace it safely, and a 15 amp well pump contactor is the most common residential size.
5. Failed Run or Start Capacitor
Jet pump motors and many small submersibles use a capacitor to start and run the motor. A run capacitor that dries out, bulges, or cracks leaves the motor with no phase shift, and the classic symptom is a pump that hums or buzzes but never spins. You can often see the failure: a swollen case, a cracked can, or burnt rubber on the leads. Test the microfarad rating against the nameplate with a multimeter, and replace it with the same MFD rating and at least the same voltage. Our breakdown of the well pump capacitor walks through the test, and a 45 to 60 MFD run capacitor covers most residential jet pump motors.
6. Faulty Pressure Switch
The pressure switch on top of the tank is what tells the pump to start. If its contacts have welded closed, the pump runs constantly; if the diaphragm fails or the contacts pitted open, the pump never receives the start signal and the house runs dry while the tank gauge sits above cut-in. A switch that is clicking rapidly is the other tell: the differential has narrowed or the tank air charge is gone. Replacement well pump pressure switches in the 30/50 or 40/60 PSI range are inexpensive, and our guide to the well pump pressure switch covers testing and replacement. If the tank itself has lost its air charge, that is a separate fix, covered in our pressure tank precharge guide.
7. Stuck Check Valve or Failed Foot Valve
When the pump runs but the house still gets no water, the failure has moved from the electrical side to the plumbing side. A check valve that passes back pressure lets the column of water drain back into the well every time the pump stops, so the pump restarts endlessly or never builds pressure. A foot valve at the bottom of the well that is clogged with sand or debris chokes the intake the same way. If the pump is running, the breaker is fine, and the water is not coming, inspect the check valve first and pull the pump only if the foot valve is suspected. Our guide to the well pump foot valve covers how to test for a passing valve before you spend on a pump pull.
8. Broken Cable, Corroded Lugs, or Open Wiring
Submersible pump cable runs the full depth of the well, and it fails where it is stressed: at the cable coupling, where it enters the casing, and at the lugs in the contactor or disconnect box. A single broken conductor means the motor gets no power no matter what the panel shows. Corroded or loose lugs are the most common open I find in older basements. The test is a test light at the load side of the contactor: voltage at the line side, none at the load side with the pump calling for water, and the fault is between those two points. Repairing cable splices is professional work for a submersible, but a corroded lug cleaned and re-torqued is a ten-minute homeowner fix.
9. Frozen Supply Line or Frozen Casing
In cold climates a well pump that stops working in a cold snap is usually a frozen water line, not a dead pump. The line between the well and the house freezes at its deepest or most exposed point, the pump keeps running against a blocked line, pressure spikes, and the overload or breaker trips. The pump is often perfectly healthy. Our step-by-step guide to unfreeze a well covers safe thawing methods for the line, the tank, and the casing, and our guide to winterizing a well house covers the insulation and heat that keep it from happening next winter.
10. Seized Motor or Shorted Winding
The last place the fault lives, and the most expensive. A motor that seized from running dry has locked bearings; a motor that shorted has a winding that now draws locked-rotor current. Both present the same way: the pump hums for a second or two and goes quiet, or trips the breaker the instant power returns. Do not keep resetting a pump that hums and stalls, because each attempt heats the windings further and can convert a repairable failure into a total loss. Our dedicated guide to a pump that hums but will not start walks through how to tell a stuck rotor from a dead winding, and if the pump runs but simply delivers no water, the cause list in our well pump runs but no water guide is the next place to look.
Well Pump Not Working: Symptom-to-Cause Diagnostic Chart
Use this chart to identify the fault in a couple of minutes. Find the symptom you are actually seeing, not the one you suspect, and run the first test listed. The chart is ordered by how often each symptom appears in our service logs.
| Symptom You Observe | Most Likely Cause | First Test to Run | Typical Fix Cost |
|---|---|---|---|
| Silent, no sound at all | Tripped breaker or disconnect switch off | Flip the breaker, check the disconnect box | $0 to $100 |
| Silent, breaker and disconnect fine | Failed contactor or open wiring | Test light at the contactor output | $25 to $150 |
| Hums for a second, then goes quiet | Seized rotor, shorted winding, or tripped overload | Check the overload reset, wait 10 minutes, try once | $200 to $3,500 |
| Hums, and it is a jet pump | Failed run or start capacitor | Test the capacitor MFD rating with a multimeter | $15 to $40 |
| Clicks, then nothing | Failed pressure switch or tripped overload | Measure voltage at the switch output | $40 to $200 |
| Runs, but no water at the tap | Passing check valve, clogged foot valve, low well, or frozen line | Check the well level, inspect the check valve | $100 to $600 |
| Trips the breaker on start, every time | Locked rotor or shorted winding | Stop resetting; call a professional | $300 to $3,500 |
| Stopped after a cold snap | Frozen water line below the frost line | Locate the freeze, apply controlled heat | $150 to $500 |
Costs reflect 2026 residential service prices in the western US for parts plus typical labor, from our repair logs and regional pump contractor quotes.
How to Test for Power at the Pump Disconnect (Safe Steps)
Once the breaker holds and the disconnect is on, the next question is where the voltage is and where it stops. This is the test that separates an electrical fault from a pump fault in about ten minutes. You need a 120 volt test light or a digital multimeter, both inexpensive, and a willingness to follow the order below exactly.
- Kill the power and verify it. Turn the well pump breaker off, then touch the test light to the two terminals at the contactor or disconnect to confirm there is no voltage. Never work on the assumption the breaker did its job.
- Inspect the connections. Look for corroded, discolored, or loose lugs at the contactor and disconnect, and check the contactor contacts for pitting. A blackened terminal is a history of arcing, and arcing is what kills these connections.
- Restore power and test the line side. Turn the breaker back on and touch the test light across the line terminals at the contactor. You should read 120 volts. If you do not, the fault is upstream: the breaker, the panel wiring, or a switched outlet feeding the circuit.
- Test the load side with the pump calling for water. Open a faucet so the pressure drops below cut-in, and test across the load terminals while the pump should be running. If you have 120 volts on the load side and the pump still does not start, the fault is on the pump side: cable, foot valve, or motor. If you have 120 volts on the line side but none on the load side, the fault is the contactor or the switch itself.
- Record what you found. Write down the readings, the pressure gauge value, and exactly what the pump did. If a professional finishes the job, those notes are worth the diagnostic fee, and they make the second visit cheaper or unnecessary.
Safety warning
120 volts can kill. Keep one hand in your pocket when testing, use a known-good test light, and if the breaker trips the instant you restore power, stop and call a professional. That is a live short, and touching terminals under that condition is the situation that sends homeowners to the emergency room.
Parts That Fix Most Well Pump Not Working Repairs
| Product | What It Fixes | Typical Price |
|---|---|---|
| 120 Volt AC Test Light | Confirms voltage at the panel, switch, and contactor in seconds | $8 to $20 |
| Digital Multimeter | Precise voltage readings, capacitor MFD tests, and continuity checks on open wiring | $30 to $150 |
| 15 Amp Well Pump Contactor | No power to the motor despite voltage at the line side, the most common dead contactor size | $25 to $60 |
| 45 to 60 MFD Run Capacitor | Jet pump motor that hums or buzzes but will not spin | $15 to $40 |
| 30/50 PSI Pressure Switch | Pump that never receives the start signal or runs constantly | $40 to $120 |
| Franklin Electric Well Mate 2 | Prevents the dry-run failures that cause most no-start faults, with low water shutoff and restart delay | $180 to $250 |
Keep the test light, the multimeter, and a spare contactor and capacitor in the garage. The two components that fail most often are the contactor and the capacitor, and having a like-for-like spare on the shelf is the difference between an afternoon fix and a two-day wait for a delivery.
When to Call a Professional (and What It Costs)
Three situations end the homeowner portion of the diagnosis. First, a pump that trips the breaker on every start has a locked rotor or a shorted winding, and pulling a submersible requires a rig, a cable, and a new pump, so the job is $1,800 to $3,500 all-in in 2026. Second, any cable splice or coupling repair on a submersible is professional work, because a bad splice underwater is how a good pump gets killed a year later. Third, if your test light shows no voltage at the panel even with the breaker on, the fault is in the service wiring and belongs to a licensed electrician. For everything in between, a diagnostic service call runs $100 to $250, and our breakdown of well pump repair cost itemizes the 2026 numbers by repair type so you can sanity-check any quote before work begins.
Budget tip
If the pump is 10 or more years old and the diagnosis points at the motor itself, get the replacement quote before you approve the repair. A $600 repair on a 15-year-old submersible is money borrowed from a $3,000 replacement that is already scheduled by the clock.
How to Keep Your Well Pump From Stopping
Most no-start failures are preventable, and the prevention is a short annual routine rather than an expensive upgrade. Here is the exact list we recommend to every homeowner after a repair:
- Check the tank air charge twice a year. A tank that has lost its precharge turns the pump into a short-cycling machine, and short cycling is what cooks contactors, overloads, and windings. The test is in our pressure tank precharge guide, and it takes five minutes with a tire gauge.
- Install a pump protector with low-water shutoff. Running dry is the number one killer of submersible motors, and a protector with low-water cutoff and a restart delay stops the motor before the bearings overheat. It is the single best insurance on the system, and the well pump protector buyer’s guide compares the leading units by amperage.
- Keep the disconnect and contactor box dry and clean. Corrosion and moisture are what turn good lugs into arcing lugs. A desiccant bag in the box and an annual visual check costs nothing.
- Know your pump. Write the make, model, full load amperage, and depth on a label inside the panel. When the pump is dead and the water is off, you will be grateful for the nameplate data you found while everything was still working.
- Winterize before the freeze, not after. Insulate the well house, keep the supply line below the frost line or heated, and never let the system sit empty in winter. The frozen-line no-starts in this guide are all preventable with insulation installed in September.
- Log one number each year: the amp draw. A healthy pump runs at or within about 10 percent of its nameplate FLA, and a draw that creeps up over the years is the earliest objective warning that a bearing is dragging or a winding is degrading. It is the same check our signs of a failing well pump guide uses as its primary early-warning test.
See Also
Related guides from WaterWellOwners:
- Signs of a failing well pump – the 12 warning signs to catch before a pump stops working
- Well pump runs but no water – the 8 causes when the pump starts but the house stays dry
- Well pump short cycling – why a pump that starts and stops constantly wears itself out
Frequently Asked Questions
Why did my well pump stop working suddenly?
In most cases the pump did not suddenly fail, it suddenly lost its start signal. The three most common sudden stops are a tripped breaker, a dead contactor, and a failed capacitor, and all three can happen without any warning because they are electrical components that wear out in one instant rather than degrading visibly. If the pump is silent, run the two-minute power check in this guide, and if it hums but will not turn, the motor or its overload is the likely cause.
Can I fix a well pump that is not working myself?
Yes, for most of the causes in this guide. A tripped breaker, a tripped GFCI, a resettable overload, a corroded lug, a contactor swap, and a capacitor swap are all within the reach of a careful homeowner with a test light and a multimeter. The work that needs a professional is pulling a submersible, splicing pump cable underwater, and any fault that lives in the service wiring at the panel. If you are uncomfortable with 120-volt testing, the diagnostic fee is the cheaper option.
My well pump hums but does not start. What does that mean?
A hum means the motor is getting power but cannot turn, which points at a seized bearing, a shorted winding, a tripped thermal overload, or on a jet pump, a dead start capacitor. Do not keep resetting the breaker, because each failed start heats the windings further. Check the overload reset button first, then follow the safe sequence in our guide to a pump that hums but will not start.
How much does it cost to fix a well pump that will not start in 2026?
It ranges from free to about $3,500 depending on the cause. A tripped breaker or GFCI costs nothing. A contactor swap is $25 to $60 in parts, a capacitor is $15 to $40, a pressure switch is $40 to $120, and a professional diagnostic is $100 to $250. A submersible motor that has seized or shorted is a replacement at $1,800 to $3,500 all-in with the rig. The diagnostic sequence in this guide is designed to get you to the correct answer before you spend a dollar of labor.
Why does my well pump keep tripping the breaker?
Repeated trips mean the motor is drawing more current than the circuit allows, almost always because the rotor is locked, a winding is shorting, or the pump is running against a blocked or frozen line. Stop resetting after the second trip, because each attempt damages the windings further. Identify the blockage or mechanical fault first, and if the pump trips on a free spin with no load, the motor is the fault and needs a professional. If the trips only happen when the tank is empty or the pressure is low, a low-water condition is starving the pump, and a pump protector is the permanent fix.
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