Quick answer
If a sump pump will not turn on, check power first: the outlet, a tripped GFCI, and the breaker. Then lift the float switch by hand; if the pump runs, the float was stuck or tangled. If it hums but does not pump, the inlet screen or impeller is clogged, the discharge line is frozen or blocked, or the check valve has failed. If it runs and water still rises, the pump may be undersized or worn. With water rising in the pit, move belongings and call. Fixr puts typical repairs at $150–$500. Call (888) 217-6781 to reach a plumbing company taking calls in your ZIP.
Follow the short menu, then your 5-digit ZIP. The line goes quiet for a few seconds while it connects; stay on. If it does not connect, call once more: companies taking calls change minute to minute.
Written & reviewed by Marcus ReedIICRC WRT
Reviewed November 4, 2026· Next review May 2027
A sump pump only matters when it rains, which is also when you find out it stopped working. Work from power to the pump itself.
If It Will Not Turn On
- 1Check power. Is it plugged in? Many sump outlets are GFCI-protected; press Reset. Check the breaker.
- 2Lift the float gently with a stick. If the pump starts, the float was stuck against the pit wall, tangled in the cord, or blocked by debris.
- 3Listen. A hum with no movement points to a jammed impeller or a failed motor.
If It Runs but Water Does Not Leave
| What you notice | Likely cause |
|---|---|
| Runs, water level stays the same | Clogged inlet screen or impeller |
| Runs, nothing comes out outside | Discharge frozen, crushed or clogged |
| Water rushes back into the pit after it stops | Failed check valve |
| Runs, hums, no flow after a dry spell | Air lock |
| Cannot keep up in heavy rain | Undersized or worn pump |
Clean It Safely
Unplug the pump before reaching into the pit. Clear gravel and debris from the inlet screen, check the impeller turns freely, and make sure the discharge pipe outside is clear and runs away from the foundation.
Talk to a plumber about this
One call reaches a plumbing company taking calls in your ZIP.
If It Runs All the Time
See sump pump running constantly.
What a Repair Costs
Fixr puts typical sump pump repairs at $150–$500, about $300 on average, and a float switch from about $75. Replacing the pump costs more. See sump pump repair.
The Call
Call when water is rising in the pit and the pump will not run, or it runs without moving water. (888) 217-6781 connects you to a plumbing company taking calls in your ZIP. Follow the short menu, enter your 5-digit ZIP and stay on while it connects; if it does not connect, call once more, because the companies taking calls change minute to minute.
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Frequently Asked Questions
Why is my sump pump not turning on?
NoPower from a tripped GFCI or breaker, a float switch stuck against the pit wall or tangled in the cord, or a burned-out motor.
Why is my sump pump running but not pumping water?
A clogged inlet screen or impeller, a frozen or blocked discharge line, a failed check valve, or an air lock.
What should I do if my sump pump fails during rain?
Move belongings off the floor, keep away from water near outlets, and call. A battery backup pump or a wet-dry vacuum can buy time.
Sources
Methodology: How we source and verify data · Report an error
Disclaimer: HearthDry is an independent educational resource. This article is for informational purposes only and does not constitute professional, legal, or insurance advice. Consult licensed professionals before making decisions about your property or insurance claims.
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