Why Is My Sump Pump Not Working? 7 Common Problems & Fixes (2026)

Don't Panic — Most Sump Pump Problems Have Simple Fixes

A sump pump that stops working at the wrong moment can mean a flooded basement and thousands of dollars in water damage. But before you call a plumber or replace the pump, it's worth knowing that most sump pump failures have straightforward causes and easy fixes.

In this guide, we'll walk through the 7 most common sump pump problems, how to diagnose them, and what to do — including when it's time to replace the pump entirely.

Problem 1: Sump Pump Won't Turn On

Possible Causes:

• No power to the pump
• Tripped circuit breaker or blown fuse
• Float switch stuck or tangled
• Burned-out motor

How to Fix:

1. Check that the pump is plugged in and the outlet has power (test with another device)
2. Check your electrical panel for a tripped breaker — reset if needed
3. Inspect the float switch — it should move freely up and down. If it's tangled around the pump cord or stuck against the pit wall, reposition it
4. Try manually lifting the float — if the pump runs, the float switch is the problem
5. If the pump still won't start with power confirmed and float free, the motor may be burned out — time to replace

Problem 2: Sump Pump Runs But Doesn't Pump Water

Possible Causes:

• Clogged or damaged impeller
• Inlet screen blocked with debris
• Air lock in the pump
• Discharge pipe frozen or blocked

How to Fix:

1. Turn off and unplug the pump
2. Remove the pump from the pit and inspect the inlet screen — clean any debris with a brush and water
3. Check the impeller for debris — remove anything blocking it
4. Check the discharge pipe for blockages, kinks, or ice (in winter)
5. Reinstall and test — pour water into the pit to verify pumping action

Problem 3: Sump Pump Runs Continuously

Possible Causes:

• Float switch stuck in the "on" position
• Check valve failed (water flowing back into pit)
• Undersized pump for the water volume
• High water table overwhelming the pump

How to Fix:

1. Check the float switch — it should drop when water level drops. If stuck up, reposition or replace
2. Check the check valve on the discharge pipe — you should hear a click when the pump shuts off. If water flows back after the pump stops, the check valve has failed — replace it
3. If the pump is correctly sized and the check valve is working, you may have a high water table issue — consider adding a second pump or upgrading to a higher-capacity model

Problem 4: Sump Pump Is Very Noisy

Possible Causes:

• Debris in the impeller
• Worn or damaged bearings
• Pump vibrating against pit walls
• Cavitation (pump running dry)

How to Fix:

1. Grinding or rattling noise — inspect and clean the impeller
2. High-pitched whining — worn bearings indicate the motor is near end of life; plan for replacement
3. Thumping noise — add a rubber pad under the pump to reduce vibration
4. Gurgling after pump shuts off — normal water backflow; install or replace the check valve

Problem 5: Float Switch Failure

The float switch is the most common point of failure in sump pumps. It's a simple device — as water rises, the float rises and triggers the pump to start; as water drops, the float drops and the pump shuts off.

Signs of Float Switch Failure:

• Pump won't turn on even with water in the pit
• Pump runs continuously even when pit is empty
• Float is tangled, stuck, or physically damaged

How to Fix:

Float switches are inexpensive and easy to replace. You can purchase a universal replacement float switch and install it yourself in about 30 minutes. Alternatively, replace the entire pump — modern pumps with tethered or vertical float switches are more reliable.

Problem 6: Sump Pump Trips the Circuit Breaker

Possible Causes:

• Pump motor drawing too much current (overloaded)
• Short circuit in the pump wiring
• Shared circuit with other high-draw appliances
• Failing motor

How to Fix:

1. Ensure the pump is on a dedicated 15-amp circuit — never share with other appliances
2. Check the power cord and plug for damage
3. If the breaker trips immediately when the pump starts, the motor has likely failed — replace the pump
4. If the breaker trips after running for a while, the motor may be overheating due to a clogged impeller or failing bearings

Problem 7: Sump Pump Smell or Odor

Possible Causes:

• Stagnant water in the pit
• Bacteria or algae growth in the pit
• Dry pit (P-trap dried out)
• Sewage smell indicates possible cross-contamination

How to Fix:

1. Clean the pit annually — remove debris and rinse with a bleach/water solution (1 cup bleach per gallon of water)
2. Ensure the pit lid is sealed properly to contain odors
3. Pour a small amount of water into the pit to prevent it from drying out completely
4. If you smell sewage, contact a plumber immediately — this indicates a serious plumbing issue

When to Replace Your Sump Pump

Sometimes a repair isn't worth it. Consider replacing your sump pump if:

• The pump is 7+ years old — average sump pump lifespan is 7–10 years
• The motor has burned out — motor replacement often costs more than a new pump
• The pump has failed multiple times — repeated failures signal end of life
• Your basement has flooded — an undersized or unreliable pump needs upgrading
• The pump runs continuously and repairs haven't solved it — you may need a higher-capacity model

FOTING Sump Pumps: Reliable Replacement Options

When it's time to replace, JUNHE PUMPS offers a full range of FOTING submersible sump pumps built for residential and light commercial use:

• 1/2 HP models — Handle up to 2,450 GPH for most standard basements
• 1 HP models — High-flow options up to 4,600 GPH for larger pits or higher water tables
• Stainless steel models — Corrosion-resistant construction for longer service life
• Cast iron models — Superior heat dissipation for continuous operation

All FOTING sump pumps feature automatic float switches, 10FT power cords, and standard 1-1/4" or 1-1/2" discharge connections.

Sump Pump Maintenance Tips to Prevent Future Problems

• Test your pump every 3 months by pouring water into the pit
• Clean the pit and inlet screen annually
• Check the float switch moves freely every 6 months
• Inspect the discharge pipe for blockages and freeze damage each spring
• Consider a battery backup pump for power outage protection
• Replace any pump over 7 years old proactively — before it fails during a storm

Conclusion

Most sump pump problems — float switch issues, clogged impellers, check valve failures — are fixable with basic tools and a little patience. But when the motor has burned out or the pump is aging, replacement is the smarter investment.

Browse our selection of FOTING sump pumps for reliable, high-performance replacements that will protect your basement for years to come. Questions about which model is right for your situation? Contact our team — we're happy to help.