Sump pump not working: causes, part cost
Prices checked 2026-08-28
A sump pump not working is most often a tripped breaker or unplugged problem - about 30% of reported jobs. Here is how to confirm it, what the part costs, and when to stop.
A sump pump has one job and it does it only during the worst weather. Faults are usually the float switch, the power, or a pump that ran dry – and every one of them is worth fixing before the next storm.
Sump pump not working is one of the most common repair searches there is. "Not working" covers a lot of ground, so start wide: is it getting power, is it being told to run, and is anything obviously broken? Most "not working" faults are found in that order.
Before you call anyone: 30-second checks
- Confirm power: breaker, outlet, cord, and any switch or reset on the unit.
- Confirm it is being told to run: settings, mode, timer, door or lid switch.
- Look and listen: anything obviously broken, burned, or silent that should not be.
The likely causes, ranked
Tripped breaker or unplugged
About 30% of sump pump not working jobs come back to this cause. A tripped breaker, GFCI or reset button is the electrical system protecting the circuit – and the cheapest "fault" on the list.
How to confirm it: Check the panel and any GFCI outlets on the circuit; if the breaker trips again immediately, the fault is in the unit or the wiring, not the breaker.
Typical fix: usually free. A capable DIYer can usually handle this one.
Faulty float switch
About 28% of sump pump not working jobs come back to this cause. Switches and interlocks tell the unit it is safe to run, and a stuck or failed switch can stop a unit dead or leave it running when it should not.
How to confirm it: A unit that will not start, or starts only when the door is held, points at the interlock switch – a cheap, common part.
Typical fix: $45. A capable DIYer can usually handle this one. You would be looking for a float switch.
Impeller clogged or seized
About 24% of sump pump not working jobs come back to this cause. Restricted airflow or a blocked path is the most common and cheapest cause in this whole list – the unit cannot breathe, so it cannot do its job.
How to confirm it: Check the filter, vent or hose run for build-up and restriction; cleaning it is free, and it is the first thing to rule out.
Typical fix: usually free. A capable DIYer can usually handle this one.
Failed pump motor or capacitor
About 18% of sump pump not working jobs come back to this cause. A motor, fan or pump with its drive components is a wear item – belts stretch, bearings dry out, capacitors lose their charge and relays stick.
How to confirm it: Listen for the motor: a hum with no movement points at a capacitor or belt; a grinding or squeal points at a bearing. Each has a different price tag.
Typical fix: $150. This one is best left to a professional. You would be looking for a pump capacitor.
When to stop and call a pro
If it has power, is being told to run, and still does nothing, the control board or a major component has failed – that is the point where the repair-or-replace maths above matters most.
How to keep it from coming back
The power-first habit prevents both wasted service calls and missed problems. A unit that will not power on at all is a different fault from one that powers on and does nothing.
Bottom line: Sump pump not working is worth diagnosing before you call anyone – the free checks above catch a surprising share of cases, and the ranked list tells you what the part should cost if it is not one of them. Run the figures through the repair-or-replace test on this page before you authorise any work, and never pay for a diagnosis without getting the part name and the price in writing first.
Likely causes, most common first
| Likely cause | How often | Typical fix | Who does it |
|---|---|---|---|
| Tripped breaker or unplugged | 30% | free | DIY-able |
| Faulty float switchfloat switch | 28% | $45 | DIY-able |
| Impeller clogged or seized | 24% | free | DIY-able |
| Failed pump motor or capacitorpump capacitor | 18% | $150 | Pro job |
Frequencies are the share of reported jobs attributed to each cause across repair-platform and forum data - a starting point for diagnosis, not a certainty.
What this should cost to put right
Across the causes listed above the repair runs $0 to $150. A quote far above the top of that range is usually a diagnosis of convenience - get a second opinion before you authorise it.
Repair it, or replace the unit?
This is the number people get wrong most often, and it costs them the most. Run the quote through the test - it uses the mid-point cost of the fix above against a new unit and the years this one has left.
REPAIR IT
The repair is 8% of a new unit and the appliance has roughly 4 year(s) of expected life left. Fixing it is the economical call. A new unit would save about $45/year in running costs, so keep repairing until that pays back in under 5 years.
Decision rule: repair when the fix costs under 50% of a replacement and the unit is under 70% through its expected life.
Other sump pump symptoms
Common questions
Is it dangerous if my sump pump has a "not working" problem?
Usually not immediately - none of the likely causes on this page involve gas, fuel or a mains electrical fault. The two cautions that apply everywhere: keep water away from any electrical point, and if you ever smell gas or burning, stop diagnosing and call a professional.
How much does it cost to fix a sump pump with a "not working" problem?
Most fixes for this run $0 to $150. The most common cause, tripped breaker or unplugged, runs about nothing - it is a free check to put right, and the part you would be looking for is not usually sold separately. Get the diagnosis in writing before authorising anything above the top of the range.
Why does my sump pump have a "not working" problem?
In about 30% of reported cases it is a tripped breaker or unplugged. It is the first thing to check because it is the most common - and usually the cheapest. If that checks out clean, work down the ranked list on this page before paying for a diagnosis.
Should I repair or replace my sump pump?
Repair it when the fix costs under half of a replacement and the unit is under 35% through its roughly 10-year expected life. Past that point a repair is usually a deposit on the next failure - run the test on this page with your actual quote before you decide.
How this figure was built
Reviewed 2026-08-28 · quarterly.
- Bureau of Labor Statistics, Occupational Employment and Wage Statistics - construction and repair trades
- EPA Energy Guide appliance ratings
- North American Electrical Metrics / manufacturer parts catalogues
National averages. Local labour can run 20-40% above or below these figures; the calculators apply a metro factor on top.
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