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Why Does My Sump Pump Keep Running?
If your sump pump runs constantly, you may have an undersized pump, a faulty float switch, an undersized system, or another sump pump issue. Home Comfort Experts explains what constant operation means, how to check for a faulty pump, and what to do when your sump pump fails.
The Quick Float Switch Check
It's normal for pump cycles to happen irregularly, responding to heavy rain and changes in water runoff. However, continuous operation without rain is a big red flag, and worried homeowners can use a basic float switch check to see whether their sump pump is functioning abnormally.
Here's how to conduct a check.
- Locate the sump pump and float switch inside the sump pit.
- Check that the float can move freely and isn't caught against the side of the pit or another component. If it is stuck, it could be causing the continuous running.
- Manually raise the float to simulate rising water.
- Listen and watch for the pump to turn on.
- Lower the float and confirm the pump shuts off.
- If the pump doesn't activate, the float switch or pump may need further inspection or replacement.
Battery backup sump pumps are one of the best ways to prevent basement flooding.
Running With No Rain: What That Means
Is your sump pump running constantly during a rainstorm? That’s likely perfectly normal. It’s also normal for your sump pump to turn on and off during a storm or continue to run after a rainstorm has ended. It can take hours, even a day, for the last of the rainwater to reach your sump pump.
If your sump pump is running, but there’s no rain, then consider the possible causes of sump pump failure.
Common Causes, Most Likely First
These are the most probable causes of sump pump failure listed from most to least likely.
- Overuse: Heavy or frequent use can wear down the pump, reducing its ability to remove water efficiently over time.
- Clogs: Dirt and debris can block the sump pit or pump and restrict water flow. A frozen discharge pipe can also prevent water from leaving.
- Power Loss: Electrical outages can prevent a primary sump pump from operating when it's needed most. This is when a battery backup pump is especially useful. These backup sump pumps kick in when the primary pump fails, preventing flooding.
- Defective Pump: Internal damage or component failure can stop the pump from working and may require replacement.
- Undersized: An undersized pump will likely run constantly during rain. Typical residential sump pump size is ⅓ horsepower, but this varies, and a professional should calculate the right size.
- High Water Table: High groundwater can cause pump failure when the water volume exceeds what the pump can handle.
When Constant Running Becomes a Repair Call
A sump pump is designed to cycle on and off, not run nonstop. Constant operation puts extra wear on the motor and other components, which can shorten the pump's lifespan and eventually lead to burnout. The longer you wait, the greater the chance the pump fails when you need it most.
If your sump pump keeps running during dry weather, won't shut off when the float drops, or struggles to keep the pit empty, it's time for a professional inspection. Home Comfort Experts can determine whether you're dealing with a stuck float, a clog, an undersized pump, a discharge issue, or failing equipment.
Don't wait for a flooded basement to confirm something's wrong. Call the professionals at Home Comfort Experts at (574) 221-8595 if the pump runs for hours without stopping, and there hasn't been a recent rainstorm.
Schedule OnlineFrequently Asked Questions
Start by checking the float switch and making sure it isn't stuck. Also check for a clogged or frozen discharge line that could prevent the pump from removing water properly.
If the float moves freely and the discharge line appears clear but your sump pump runs constantly, the problem may be an incorrectly sized pump, a high water table, or a mechanical failure. Home Comfort Experts recommends testing the system periodically by adding water to the pit and confirming that the pump turns on and shuts off normally. If it doesn't, schedule professional sump pump repair.
A sump pump running every five minutes can be normal during heavy rain or snowmelt because water may be entering the pit quickly. However, frequent cycling during dry weather deserves attention. If the pump repeatedly starts and stops after removing only a small amount of water, it may be short cycling. If you're wondering why your sump pump keeps running, have the system inspected rather than assuming frequent cycling is normal.
There isn't one safe maximum runtime for every sump pump. How long a pump can operate continuously depends on its design, duty rating, water conditions, installation, and whether it's actually pumping water. Continuous dry running can overheat a pump and damage its seals.
A sump pump typically lasts about 7 to 10 years, although its lifespan depends on how often it runs, installation quality, maintenance, and the amount of water and debris it handles. A pump that runs frequently may wear out sooner than one that only operates occasionally. If your sump pump is approaching 10 years old, runs constantly, makes unusual noises, or has trouble removing water, consider having it inspected.
