Sump Pump Running Constantly
Pump runs non-stop even when the pit is nearly dry
75% chance this is caused by:
Failed check valve or incorrect float switch position
Sump Pump running constantly is a medium-difficulty repair. The most likely cause is failed check valve or incorrect float switch position, and replacing the failed part takes approximately 30 minutes. The part costs about $15 — compared to $150-500 for a full replacement.
Fix it this weekend. Most parts ship same-day on Amazon.
A service call costs $150-300. This repair takes about 30 minutes and the part runs $15. Order the part tonight, fix it Saturday morning.
✓ Good call investigating this. Most homeowners wait until the problem gets worse — which typically means a higher repair bill. This is a medium-rated repair — 65% of homeowners with basic tools complete it successfully. A $15 part saves you a $150–300 service call.
The exact part you need is listed below — order it now and fix it this weekend.
Safety Warning
YES
🔧 The Exact Part You Need
Total parts cost: $15. Same-day shipping available on most items.
What happens if you don't fix this
A $15 part now can prevent a much bigger problem later. Left unfixed, this issue can cascade into a $$150-500 replacement — that's × the cost of the part. The repair gets more expensive the longer you wait.
Find the Right Part for Your Sump Pump
Parts vary by model. Search with your model number for the best match.
Tip: Add your model number (e.g. "GE GSS25GSH") for more precise results.
🔥 Parts for Sump Pumps move fast on Amazon — especially common failure parts like these.
Repair Summary
| Appliance | Sump Pump |
| Problem | Running Constantly |
| Diagnosis Confidence | 75% |
| Most Likely Cause | Failed check valve or incorrect float switch position |
| Difficulty | medium |
| Estimated Time | 30 minutes |
| Parts Cost | $15 |
| Replacement Cost | $150-500 |
📋 Step-by-Step Instructions
Unplug the pump before inspecting
Check the float switch position — it may be set too low
Listen for water running back into the pit after the pump shuts off
If water flows back, the check valve is broken and water recirculates
To replace: mark the discharge pipe, cut above and below the old valve, install new one with hose clamps
Test by pouring water into the pit and watching for backflow
Don't put this off.
A Sump Pump that's failing can cause water damage, electrical issues, or food spoilage — each costing 10x what the replacement part costs. The fix is straightforward. The part is cheap. The risk of waiting isn't.
🔍 Why This Happens
Root cause analysis for your sump pump's running constantly
The sump pump check valve in your sump pump wears down through normal mechanical operation. Every wash cycle, the motor and pump spin thousands of times — bearings gradually wear, seals degrade, and moving parts lose tolerance. This component handles high mechanical stress and eventually fatigue causes it to crack, stretch, or seize. At 75% probability for this symptom, it's the most likely culprit.
75%
Diagnostic match rate
Moderate
DIY success rate
30 minutes
Typical repair time
🛡️ Prevention Tips
How to prevent your sump pump's running constantly from happening again after this repair.
Test the pump every 3 months by pouring water into the pit. Confirm the float switch activates and the pump discharges properly.
Clean the sump pit annually — remove debris that can jam the float switch or clog the intake.
Install a check valve on the discharge line if you don't have one. Without it, water flows back into the pit after each cycle, causing the pump to short-cycle.
Consider a battery backup pump. Power outages during storms are exactly when you need the sump pump most.
When installing the new sump pump check valve, take a photo before removing the old one. Mechanical alignment is critical — getting the position wrong causes premature failure of the replacement.
Other Sump Pump Problems
Common Questions About This Repair
How much does it cost to fix a sump pump that's running constantly?
How long does this sump pump repair take?
What if this isn't the problem?
Should I just replace my sump pump instead?
🔧 Repair Data Sources
Repair guides are compiled from:
- • Manufacturer service manuals and technical bulletins
- • Common failure pattern data from appliance repair technicians
- • OEM parts databases for exact replacement compatibility
Difficulty ratings are based on the average homeowner's skill level, not professional standards. Confidence percentages reflect the likelihood that the listed cause matches the observed symptom. Updated May 2026.
Disclaimer: This repair guide is for informational purposes only and is based on manufacturer service manuals and published repair data. TheFixGuide is not responsible for any damage, injury, or loss resulting from attempted repairs. If a repair involves gas, high voltage, stored energy (capacitors), or refrigerant, we strongly recommend hiring a licensed professional.
🔨 Need tools? Get parts on Amazon
Get Parts →Dex A. Varland
Master Appliance Technician · 15+ Years Experience
Dex A. Varland is a master appliance technician with 15+ years of hands-on experience across all major brands. He has diagnosed and repaired thousands of household appliances and contributes to TheFixGuide to help homeowners tackle repairs with confidence.
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