Sump pumps protect homes and valuables by preventing water damage, but like any equipment, they can develop problems.
The most common sump pump issues include the pump failing to start, running continuously, making unusual noises or vibrations and operating inefficiently. Addressing these problems quickly can prevent thousands of dollars of water damage and protect your basement, foundation and belongings. Here’s how to spot the most common sump pump problems.
What Are the Most Common Sump Pump Issues?
From faulty outlets to clogs, this list will help you understand and troubleshoot common sump pump issues:
1. Sump Pump Won’t Start
When your sump pump won’t start, your home is vulnerable to flooding. This issue can stem from electrical problems or mechanical obstructions. Common causes include:
- Tripped circuit breaker: A switched-off breaker cuts power to the pump. Check your breaker panel and reset any tripped switches.
- Malfunctioning outlet: If you’re not getting power, confirm your pump is connected to the outlet. If the pump is connected, test it with another device to determine if the outlet or the pump is causing the issue. You should also have a ground fault circuit interrupter (GFCI) installed.
- Blown or loose fuse: Fuses protect your equipment from current surges — they blow and break the circuit to protect other components. Check your user manual for the location of fuses and call an electrician to remove or replace them.
- Low basin water level: The pump activates only when water reaches a specific height. If the basin level is too low, the pump won’t start — this is normal operation, not a malfunction.
- Obstructed pump float: The float switch senses water levels and triggers pump activation. When debris blocks the float, it can’t move freely, preventing the pump from starting.
2. Sump Pump Runs Continuously
A continuously running sump pump signals an undersized system, a defective float switch, or a clogged discharge line. Non-stop operation leads to excessive wear and premature burnout. Here’s what to check:
- Undersized pump capacity: An undersized pump struggles to handle heavy water influx, causing it to run continuously without lowering water levels. If water stays the same or rises, you need a higher-capacity unit.
- Defective float switch: A malfunctioning float fails to signal the pump to turn off, causing continuous operation. Replace the float switch to restore proper cycling.
- Clogged discharge line: The discharge line expels water from the pit. When clogged, the pump runs continuously without moving water, potentially causing line rupture or accelerated wear.
3. Sump Pump Is Noisy or Vibrating
Unusual sump pump noises or vibrations may indicate a debris-filled impeller, trapped air, or loose pipes. While some operational noise is normal, grinding, scraping, squealing or rattling sounds require attention. Look for the following signs:
- Debris-filled impeller: The impeller moves water out of the pit when driven by the motor. Pebbles, grit and dirt trapped in the impeller cause vibration and grinding sounds. Clear debris promptly to prevent component damage.
- Trapped air in the system: Air trapped in the pump line can cause buzzing or rumbling. Submerge the intake fully and clean the intake screen to release trapped air. For recurring airlocks, have a professional drill an air-relief hole.
- Loose or resonating pipe or line: If a line is loose or leaning against a wall or floor, it will resonate. You may feel a vibration in the floors and walls around the sump pump. You can add pipe supports and isolate where pipes touch wood or concrete with rubber.
4. Sump Pump Is Inefficient
An inefficient sump pump can result from a faulty check valve, worn impeller or miscalculated pumping distance. When your pump runs but fails to drain water effectively, your home remains at risk. Check these specifics:
- Faulty check valve: The check valve prevents backflow into your system. If it’s faulty, it could cause less or no water to flow out, and you’ll need to have it replaced.
- Worn impeller or blocked pump inlet: A worn impeller or clogged inlet restricts water flow, forcing the motor to work harder without effectively draining water. Clean the inlet and replace the impeller if worn.
- Miscalculated vertical pumping distance: If you have a new sump pump installation but notice it’s not removing as much water as it should, it may be because the motor is underpowered for the vertical distance it needs to pump. You’ll need to contact a professional to reroute or replace pipe fittings so the impeller can push the water up.
Preventing Sump Pump Problems
Regular maintenance prevents most sump pump issues. Perform these tasks monthly during dry seasons and after every heavy storm. Always unplug the pump before starting any maintenance:
- Do a water test: Outside of the rainy season, pour water into your pit to ensure the pump starts and stops properly.
- Clean the pit and intake: Unplug the pump and remove any buildup of silt and debris in your basin, cleaning the intake and impeller too.
- Verify float movement: During a water test, check that the float moves freely.
- Inspect valves and lines: Confirm that the check valve arrow is pointing up or away and ensure your discharge line is unkinked and the outdoor outlet is clear.
- Confirm uninterrupted power: Inspect the outlet and power cables for damage. Ensure your circuit breaker panel is in working order.
When to Call a Pro for Sump Pump Issues
Professional sump pump service is necessary for electrical hazards, imminent flooding and burst lines. Common jobs you should leave to the professionals include resizing for vertical pump distance or rerouting discharge.
For Emergency Issues
Call a plumber immediately if you notice any of the following:
- Electrical hazards like faulty wiring, blown fuses or broken outlets.
- Imminent flooding, and the pump won’t start.
- Burst lines that need replacement.
After Basic Checks
Contact a professional if you’ve done basic checks like freeing the float, cleaning the intake and checking the pit’s water level and the following issues are still present:
- Continuous running
- Grinding, whining and severe vibrations
- Weak or no water flow
- Aging pump with reduced performance
What’s the Average Life Expectancy of a Sump Pump?
A properly maintained sump pump can last up to 10 years. But your pump’s lifespan may vary depending on usage frequency, water volume and maintenance quality. Pumps in regions with frequent heavy rainfall or high water tables work harder and may need to be replaced sooner.
Signs your sump pump is nearing the end of its lifespan include:
- Frequent cycling.
- Reduced pumping capacity.
- Rust or corrosion on components.
- Unusual noises that persist after cleaning.
- Declining performance.
Why Choose Star Water Systems for Your Sump Pump Needs?
Now that you know the most common sump pump problems and how to fix them, you can create a maintenance schedule and know when to call a professional. If no fixes are working or your sump pump is at the end of its life, Star Water Systems provides a wide selection of high-quality sump pumps for every need.
Contact us today for more information, or find a retailer near you to purchase our products!
