If you’ve noticed that your sump pump is running non-stop, you’re probably frustrated and worried about the long-term damage it could cause. A sump pump should only activate when there’s water to pump. Still, when it keeps running, it’s working overtime, putting unnecessary wear on the motor and wasting energy. As a homeowner, the last thing you want is for your sump pump to fail when you need it most, especially after a storm or heavy rainfall.

I’ve seen this happen repeatedly, and I understand how overwhelming it can be to figure out the cause and how to fix it. Don’t worry; in this article, I’ll walk you through the most common reasons your sump pump might be running constantly and, more importantly, how to fix it fast. By the end of this post, you’ll have the knowledge to troubleshoot your pump and get it back in top working condition—saving you time, money, and potential headaches.

Common Causes for a Sump Pump to Run Continuously

A sump pump that runs continuously can cause a lot of stress for homeowners. Not only can it lead to higher energy bills, but it can also cause unnecessary wear on the pump. Let’s take a look at some of the most common causes that could be behind your sump pump running nonstop.

1. Malfunctioning Float Switch

The float switch is a crucial part of your sump pump. It’s responsible for turning the pump on and off based on the water level in the sump pit. The float switch triggers the pump to start working when the water rises. Once the water level drops, the float switch tells the pump to stop.

Suppose the float switch is malfunctioning or stuck in the “on” position. In that case, your pump will run continuously, even when it’s not necessary. This can happen if the float gets caught in debris or damaged. Sometimes, the float might get tangled in other parts of the pump or stuck against the sides of the sump pit.

How to Fix It

First, ensure the float switch is not obstructed by debris or stuck against anything. You can carefully inspect the sump pit to ensure that it moves freely. You might need to replace it if I should be worn out. This is a simple repair that a professional can handle quickly if you’re uncomfortable doing it yourself.

2. Blocked or Clogged Discharge Pipe

Your sump pump does its job by pushing water out of the pit and away from your home through the discharge pipe. The water can’t exit the pit properly if the discharge pipe becomes blocked or clogged. When this happens, the pump will continue running, trying to push water with nowhere to go.

During colder months, debris, dirt, or even ice can block the discharge pipe, causing the pump to work overtime. Sometimes, leaves or other foreign objects can get lodged in the pipe, causing an obstruction. Over time, these blockages can result in the pump running nonstop.

How to Fix It

Check the discharge pipe for any visible signs of a blockage, such as dirt, debris, or ice buildup. You can flush the pipe with water to clear out the obstruction. If there’s a more significant clog, you may need to use a plumber’s snake or hire a professional to clear the pipe. Inspecting the pipe regularly to prevent future blockages is also a good idea.

3. Faulty Check Valve

The check valve is a small but crucial component in your sump pump system. Its primary job is to prevent the water pumped out of the sump pit from flowing back in. If the check valve is faulty, water can flow back into the pit, causing your sump pump to run continuously to pump out that water.

A faulty check valve may not close properly or be damaged due to age or wear. This can lead to “water recirculation,” where the pump ends up pumping the same water in and out repeatedly, never actually getting rid of it.

How to Fix It

Check the check valve for any signs of damage or wear. If it’s not functioning properly, it may need to be replaced. The good news is that replacing a check valve is usually a quick and inexpensive fix, and it’s a job you can do yourself if you’re comfortable with basic plumbing tasks. Just make sure you purchase the correct size version for your system.

Suppose you’re not sure whether your check valve is the problem. In that case, a professional plumber can easily diagnose and replace it for you.

4. Undersized or Incorrectly Installed Sump Pump

Another common cause of a sump pump running continuously is that it might be undersized for the amount of water it needs to handle. If your sump pump is too small, it won’t be able to keep up with the water entering the sump pit, which means it will run more frequently and for more extended periods.

Additionally, if the sump pump was incorrectly installed, it could be operating less efficiently, causing it to run continuously. Sometimes, the installation might not allow proper drainage or pump placement, leading to excessive work and strain on the motor.

How to Fix It

Suppose you suspect that your sump pump is undersized or improperly installed. In that case, it might be time for an upgrade or a reinstallation. Check the specifications of your pump to ensure it’s rated for the amount of water your basement or crawl space is likely to collect.

Consulting with a professional plumber or pump expert can help determine whether your pump is correctly sized for your needs. They can also help re-install or replace the pump if necessary. If your current pump is working harder than it should, upgrading to a more efficient, properly sized model can prevent the issue from recurring and extend the lifespan of your system.

5. Clogged Inlet Screen or Filters

The inlet screen or filter is designed to keep debris, dirt, and small rocks out of your sump pump. Over time, these filters can become clogged with debris, especially if there’s a lot of silt, leaves, or other materials in the water. When the inlet screen or filter is blocked, the water flow is restricted, and the pump may struggle to operate effectively. This can cause it to run continuously, trying to pump water that can’t flow into the system properly.

A clogged inlet screen can also lead to the pump overheating since it’s working harder than it should to move water through the system.

How to Fix It

To fix this issue, check the inlet screen or filter for any visible blockages. You can clean the screen by removing it and rinsing it off, or you may need to replace it if it’s damaged or too clogged to clean properly. Regularly cleaning the inlet screen and filters will help ensure that your pump continues to run efficiently and doesn’t have to work harder than necessary.

If you notice the screen or filter becomes clogged frequently, it could be a sign that you need to adjust the type of filter or install a higher-quality mesh to prevent debris from entering.

6. Broken or Damaged Impeller

The impeller is the part of your sump pump that pushes water through the system. It’s a small, rotating piece responsible for creating the pressure that moves water out of the sump pit and away from your home. Over time, the impeller can become worn or damaged, especially if debris or hard particles are present in the water. A broken or damaged impeller may not effectively move the water, and this could cause the pump to run non-stop in an attempt to do its job.

In some cases, the impeller may be completely broken or have become jammed with debris, causing it to stop working.

How to Fix It

Inspect the impeller for any signs of wear, cracks, or damage. If you find any issues, you will need to replace the impeller. Depending on the model of your pump, this may require a bit of disassembly, so if you’re not comfortable doing it yourself, it’s a good idea to call a professional plumber.

In many cases, cleaning the impeller or removing debris may solve the problem. If the impeller is too far gone, replacing it will restore your pump to full functionality and prevent it from running continuously.

How to Troubleshoot Your Sump Pump Running Continuously

If your sump pump is running non-stop, don’t panic. You can take a few steps to troubleshoot the problem and fix it before it causes any serious damage. Let’s dive into the key steps for diagnosing the issue.

Inspect the Float Switch

One of the first things to check is the float switch. As discussed earlier, this small device tells your sump pump when to turn on and off. If the float switch is stuck or malfunctioning, the pump could keep running indefinitely, even when there’s no need for it.

To inspect the float switch, open the sump pit and check to see if the float is moving freely. If it’s stuck against the side of the pit, tangled in debris, or obstructed in any way, gently move it into the correct position. Ensure there’s no buildup around the switch and it’s not clogged with dirt or grime.

If the float switch seems damaged or isn’t responding properly, it may need to be replaced. Replacing a malfunctioning float switch is usually a quick fix, but if you’re unsure, don’t hesitate to contact a professional plumber for help.

Clean the Discharge Pipe and Inlet Screen

Next, you’ll want to check the discharge pipe and inlet screen. A clogged or blocked discharge pipe can cause your sump pump to keep running, as the water has nowhere to go. Similarly, a clogged inlet screen can prevent water from entering the pump efficiently, forcing it to work harder than it should.

Start by inspecting the discharge pipe. Look for any signs of obstruction, such as dirt, leaves, or ice if it’s winter. If you spot a blockage, try to clear it by flushing the pipe with water or using a plumber’s snake to remove stubborn debris.

Next, check the inlet screen. This filter helps prevent dirt and debris from entering the pump and clogging it up. Over time, it can become clogged with debris. Remove the screen, clean it thoroughly, and ensure it’s free from any blockages. If the screen is damaged or too clogged to clean effectively, it’s best to replace it.

Test the Check Valve for Proper Function

The check valve is essential in preventing water from flowing back into your sump pit once it’s been pumped out. Suppose the check valve isn’t working correctly. In that case, it can lead to water recirculation, which causes your sump pump to keep running. This problem can often go unnoticed, but it can result in unnecessary strain on your pump and increase your energy bills.

To test the check valve, look for any visible leaks or signs of damage. When the pump runs, check if the water flows back into the pit. If you see water recirculating, that’s a clear sign the valve isn’t working correctly.

If the valve is faulty, you’ll need to replace it. This is a fairly simple repair, but ensuring the new valve fits your pump’s specifications is essential. A professional plumber can help ensure it’s replaced correctly if you’re unsure about doing it yourself.

Ensure Your Sump Pump is Sized Correctly

An undersized sump pump can struggle to keep up with the water flow, especially during heavy rainfall. Suppose your sump pump is too small for the water entering your pit. In that case, it may run continuously, trying to keep up with the volume of water it’s supposed to pump out.

To ensure your pump is sized correctly, check the specifications of your pump and compare them to the size of the sump pit and the amount of water it needs to handle. If the pump is undersized, upgrading to a larger model that can handle the load more efficiently might be time.

An incorrectly installed pump can also contribute to continuous running. If your sump pump wasn’t installed at the right angle or depth, it could cause water to pool in the pit and make the pump work harder than necessary. If you’re unsure about the sizing or installation, consulting a professional is worth ensuring everything is properly adjusted.

Check for Blockages and Clean the System

One of the simplest ways to troubleshoot a continuously running sump pump is by checking for blockages. Over time, debris, dirt, or even sediment can accumulate inside the pump and pipes, preventing water from flowing freely and forcing the pump to keep running.

Start by visually inspecting your sump pit, pump, and connected pipes. Look for any signs of debris, dirt, or objects that may obstruct the water flow. If you find any blockages, remove them carefully.

Next, clean the sump pit and the pump itself. You can use a hose to flush out any remaining dirt or sediment. Cleaning the system regularly is an easy way to ensure the pump operates smoothly and efficiently, reducing the risk of running continuously. If you’re unsure about cleaning or noticing persistent blockages, it’s best to consult a professional for further assistance.

Following these troubleshooting steps, you can identify and resolve the issues causing your sump pump to run continuously, helping it function properly and avoid unnecessary wear. Regular maintenance and monitoring are key to keeping your system in top condition, ensuring you’re ready for whatever the weather brings.

Conclusion

If your sump pump runs continuously, it’s crucial to identify and fix the problem quickly to avoid damage and unnecessary costs. Common issues include a malfunctioning float switch, a blocked discharge pipe, a faulty check valve, or an undersized pump. Regularly inspecting and cleaning these components can help keep your sump pump running smoothly. If you’re unsure about the cause, consulting a professional is always a good idea. Addressing these problems early ensures your sump pump is ready to protect your home when needed.

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