Why Your Sump Pump Won’t Stop Running: Common Causes & Quick Fixes

You are lying in bed in the middle of a quiet Ontario night. The rain stopped hours ago but you still hear that familiar rhythmic hum from the basement. It is the sound of your sump pump working hard. While that sound usually provides peace of mind it starts to feel like a warning when it never stops.

A sump pump that runs without a break is a common concern for homeowners in London and Southwestern Ontario. Our local geography often features heavy clay soil and high water tables which keep these systems busy. However there is a thin line between a hardworking pump and a failing one. Understanding why your sump pump keeps running can save you from a burnt-out motor and a very expensive basement cleanup.

Is It Normal for a Sump Pump to Run Constantly?

There are specific times when a constantly running pump is actually doing exactly what it was designed to do. During the “Big Thaw” in March or after a multi-day spring downpour the ground becomes saturated. In these cases the water table rises and the pump must work continuously to keep the water level below your basement floor.

Distinguishing Between High Demand and Mechanical Failure

If the weather has been dry for several days and your pump is still cycling every few minutes you likely have a mechanical issue. A healthy system should move the water out then shut off completely until the pit refills. If the motor stays engaged even when the pit is nearly empty the system is wasting energy and wearing down its internal components.

You can learn more about how these systems integrate with your overall home health by reading about all about plumbing and home maintenance.

Sump Pump Troubleshooting: Why It Won’t Shut Off

When performing sump pump troubleshooting you should start with the most common mechanical culprits. Most modern pumps are simple machines but they rely on a few moving parts that are prone to wear and tear.

1. The Float Switch is Stuck or Tangled

The float switch is the most frequent cause of a runaway pump. Think of this like the ball inside a toilet tank. As water rises the float lifts and tells the motor to turn on. When the water drops the float should fall and cut the power.

Over time the vibration of the pump can cause the unit to shift inside the basin. If the pump moves the float might get pinned against the side of the plastic pit. If it cannot drop down the pump “thinks” the water level is still high and keeps running. Debris like small rocks or dirt buildup can also jam the switch in the “on” position.

2. A Faulty or Broken Check Valve

The check valve is a small one-way flap located on the discharge pipe. Its job is to let water out but prevent it from flowing back into the pit once the pump stops. If this valve fails or cracks the water that was just pumped out will rush back into the basin as soon as the motor pauses. This creates a “loop” where the pump empties the pit only to have the same water refill it seconds later. If you hear a loud clunking sound or see water swirling back into the pit you likely need a new valve.

3. The Sump Pit is Too Small or Too Deep

Sometimes the issue is the original installation. If the pit was dug too deep it may be sitting below the natural water table of your property. This means the pump is essentially trying to drain the entire neighborhood’s groundwater. Conversely if the pit is too small it fills up too fast causing the pump to cycle rapidly which mimics constant running.

4. Clogged Discharge Lines and Frozen Pipes

In Ontario winters we often deal with frozen discharge lines. If the pipe that carries water away from your house is blocked by ice or debris the pump will push against a wall of pressure. It will keep running because the water level never actually drops. This is a dangerous scenario because the motor can overheat quickly when it cannot move any liquid.

The Hidden Risks of a Non-Stop Sump Pump

Many homeowners ignore a running pump because “at least it’s working.” While that is true in the short term ignoring the problem leads to two major headaches.

Motor Burnout and Imminent Failure

Sump pump motors are designed for intermittent use. They use the surrounding water to stay cool while they work. If the pump runs 24/7 the internal seals and bearings begin to degrade from the heat. Eventually the motor will seize. This usually happens at the worst possible time like during a heavy thunderstorm when you need the pump most.

Impact on Your Utility Bills

A standard sump pump uses a significant amount of electricity. If it runs continuously it can add a noticeable amount to your monthly hydro bill. Beyond the power cost you are also potentially paying for a full system replacement much sooner than necessary. Most quality pumps should last seven to ten years but a runaway pump might fail in less than three.

Quick Fixes You Can Try Right Now

Before calling in a technician there are a few manual checks you can perform safely.

• Ensure the pump is upright. Sometimes the torque of the motor causes the pump to tilt until the float hits the basin wall.
• Clear out any debris. Reach into the pit (with the power off) and remove any gravel or silt that might be interfering with the switch.
• Check the discharge outlet. Walk outside and make sure the pipe where the water exits is not submerged in a puddle or blocked by leaves.
• Listen for the check valve. If you hear water rushing back into the pit after a cycle the valve needs to be replaced.

When to Call Ashworth Drainage for Professional Help

If you have cleared the debris and checked the float but the motor still won’t quit it is time for professional intervention. Dealing with groundwater is a specialized task that goes beyond basic plumbing. Our team can assess if your pump is undersized for your lot or if your exterior drainage is forcing too much water toward your foundation.

We provide expert sump pump services to ensure your home stays dry regardless of the weather. Don’t wait for the pump to fail and leave you with a flooded basement. If your system is showing signs of struggle contact us today for a full inspection. We can help you decide if a simple part replacement or a more robust dual-pump system is the right choice for your home.

FAQs

How long can a sump pump run before it burns out? Most pumps can run for several hours during a storm without issue. However if a pump runs for more than 24 hours straight without a break it is at high risk for thermal overload and permanent motor damage.

Why is my sump pump running when it hasn’t rained? This often happens due to a high water table or an underground spring near your foundation. It can also be caused by a broken water main or a neighbor’s drainage being diverted toward your property.

Does a running sump pump use a lot of electricity? Yes. While it won’t break the bank in a single day a pump running 24/7 can add $30 to $50 to your monthly utility bill depending on the horsepower of the motor.

Can I manually shut off my sump pump if it won’t stop? You can unplug it briefly to prevent the motor from burning out but you must monitor the water level closely. If the water rises above the pit you risk a flood. It is better to fix the float switch immediately.

What is the average lifespan of a sump pump in London Ontario? Due to our heavy clay soil and seasonal freeze-thaw cycles most pumps in this region last between 5 and 8 years. Regular maintenance can extend this slightly.