Why Does My Sump Pump Keep Turning On and Off?

That nonstop cycling from your sump pump isn’t just annoying; it’s unsettling. Every time it kicks on again leaves you worried about basement flooding, costly repairs, or a system that might fail when you need it most.

You’re right to be concerned. At Meyer’s Companies, Inc., we’ve been taking care of homeowners’ sump pumps since 1951. A sump pump that keeps turning on and off usually isn’t normal. This behavior puts unnecessary strain on the system and could lead to water damage if left unchecked. It’s important to figure out the issue quickly to prevent problems from worsening.

Here are the most common reasons why your sump pump may be short-cycling:

•   A clogged or frozen discharge pipe: Blockages stop water from flowing out of the system.
•   Constant groundwater flow: The system may be overwhelmed by too much water entering the pit.
•   An incorrectly sized pump: The pump may be too powerful or not powerful enough for your home’s needs.
•   Electrical problems: Faulty wiring or power supply issues can cause the pump to operate erratically.
•   A faulty check valve: If this valve fails, water can flow back into the pit, causing the pump to cycle again.

Let’s examine each of these causes and what you can do about them.

Could a Clogged or Frozen Discharge Pipe Cause Sump Pump Issues?

The discharge pipe carries water away from your home, so a blockage or freezing can create continuous cycling issues. If the pipe is blocked by debris or frozen in cold weather, water doesn’t flow out properly. This means water will flow back into the sump pit, triggering the pump to turn on repeatedly.  

How to tell if this is the issue:  

• Check the pipe for blockages, especially at the exit point.  
• During winter, look for signs of freezing, like ice buildup or water pooling near the pipe.  

How to fix and prevent it:  

• Clean the discharge line regularly to prevent blockages.  
• Insulate pipes in unheated areas to prevent freezing.  
• Install a vented pipe cover to keep debris and ice out.  
• Use heat tape on exposed sections of pipe in extreme cold.  

Is Groundwater Constantly Flowing Into Your Sump Pit?

If you live in an area with heavy rainfall or a high water table, your sump pump might be turning off and on frequently to keep up with groundwater seeping into the pit. This doesn’t necessarily mean your pump is malfunctioning; it’s just working harder to keep your basement dry.  

How to tell if this is the case:  

• Your pump runs more frequently during wet seasons or after heavy rain.  
• The water level in the pit rises quickly, even after the pump cycles.  

What you can do:  

• Improve your yard’s drainage to divert water away from your foundation.  
• Install a backup sump pump for added capacity.  
• Consider a battery backup system to protect your home during power outages.  
• Consult a professional about waterproofing your basement or upgrading your sump pump system.  

Is Your Sump Pump the Wrong Size for Your Home?

The size of your sump pump matters more than you might think. An overpowered pump can empty the pit too quickly, leading to rapid on/off cycling. An underpowered pump, on the other hand, might struggle to keep up with water inflow, causing it to run continuously without fully draining the pit.  

How to tell if pump size is the problem:  

• The pump runs for only a few seconds at a time (overpowered).  
• The water level never drops sufficiently, or the pump runs constantly (underpowered).  
• The motor gets hot to the touch, or you notice unusually high electricity usage.  

What to do:  

• Have a professional evaluate your home’s needs and recommend the right pump capacity.  
• If your pump is the wrong size, replacing it with a properly sized model can solve the issue.  

Could Electrical Issues Be Why Your Sump Pump Keeps Cycling?

Electrical problems can cause your sump pump to behave unpredictably. Power surges, loose connections, or a failing motor can all lead to frequent cycling or stop your pump from working altogether.  

Signs of electrical trouble:  

• Flickering lights when the pump runs.  
• A burning smell near the pump.  
• Tripped circuit breakers.  
• The pump motor makes strange noises.  

What to do:  

• Stop using the pump immediately if you suspect electrical issues.  
• Call a professional to inspect the wiring and motor.  
• Never attempt electrical repairs without proper training. It can be dangerous.  

Is a Faulty Check Valve Letting Water Flow Back Into Your Sump Pit?

The check valve prevents water from flowing backward through the discharge pipe after the pump shuts off. If this valve is damaged, missing, or improperly installed, water will drain back into the sump pit, causing the pump to turn on again unnecessarily.  

How to tell if this is the problem:  

• Listen for water flowing back into the pit after the pump shuts off.  
• Inspect the check valve on the discharge pipe for damage or improper installation.  

How to fix it:  

• Replace a damaged or missing check valve.  
• Check that the valve is installed properly, with the arrow pointing away from the pump.  

Get Your Sump Pump Back on Track

Most sump pump issues have straightforward solutions. Start with the simple checks, like confirming that pipes aren’t obstructed and that the check valve is working correctly, before letting a professional help you with more complex fixes. Regular maintenance can prevent many of these problems from developing.

If you’ve tried troubleshooting and your sump pump still cycles constantly, it’s time to reach out to us at Meyer’s Companies, Inc. Our experienced technicians can diagnose the issue and provide lasting solutions.