Is Your Sump Pump Float Switch Not Working? 5 Common Issues to Check

Is your sump pump float switch not working properly? It’s a problem that can cause more than a small inconvenience. This common sump pump issue often leaves many puzzled since the root cause isn’t immediately clear. However, knowing the common problems that can affect this crucial part can help you troubleshoot sump pump issues and avoid damage to your home.

1. Blockage or Debris

One of the common reasons that a sump pump float switch doesn’t work is a blockage or buildup of debris. Over time, dirt, small stones, and other particles can collect in the sump pit, blocking the movement of the float switch. This obstruction can cause the switch to stick in the “off” or “on” position, preventing it from working properly.

How to Fix It

If you suspect debris is causing the issue, check if the float can move freely within the pit. If there’s resistance or a blockage, this might be the cause of your sump pump problems. To fix this, unplug the pump, drain out the sump pit, and remove any noticeable debris. This often restores the float switch to working order.

2. Corrosion

Another culprit behind a non-working float switch is corrosion. Sump pumps sit in damp, dark environments, making them prone to rust and corrosion over time. The metal components within the float switch mechanism can degrade, especially if they’re exposed to water with a high mineral content.

How to Fix It

If you suspect corrosion, inspect the float switch mechanism for signs of rust or metal degradation. Corrosion can cause the float to get stuck or fail to engage the pump. Minor corrosion can be resolved by cleaning the affected parts gently. However, severe corrosion sometimes means that you have to replace the float switch or the entire sump pump.

3. Improper Float Switch Rating

Sump pump float switches are designed for specific water volumes and pump types. Using a switch not rated for your particular sump pump can lead to frequent malfunctions. If the float switch is too sensitive or not sensitive enough, it won’t respond correctly to changing water levels, potentially leaving your pump idle when it should be running.

How to Fix It

To determine if an incorrect rating is the issue, check the switch’s specifications against the pump’s recommended float switch rating. If the rating doesn’t match, upgrading to a compatible float switch is the best solution. If you’re having trouble finding the specifications, call a pro for help. This small adjustment can significantly improve your sump pump’s reliability and performance.

4. Electrical Issues

Sometimes, a sump pump float switch not working is due to electrical issues rather than a sump pump clog or corrosion. The switch is part of the pump’s electrical circuit, so any loose connections, damaged wiring, or circuit problems can disrupt the float’s ability to signal the pump.

How to Fix It

If you had a power surge recently or you suspect another type of electrical issue, look for frayed wires or connections that may have come loose. Although some electrical problems can be fixed by securing connections, you should not attempt other repairs. Electrical issues in sump pumps are best left to a local sump pump professional.

5. Improper Installation

Improper installation is another factor that may lead to a malfunctioning sump pump float switch. The switch needs to be positioned correctly in the sump basin to move up and down freely with changing water levels. If someone installed it in an awkward position or a tight, constrained space, the float switch can get stuck or fail to activate the pump properly.

How to Fix It

If your float switch hasn’t been working consistently since installation, improper setup could be the root cause. Call a vetted sump pump pro near you to fix the issue. 

What Happens When a Float Switch Fails?

A malfunctioning float switch isn’t just a minor inconvenience. It can have serious consequences.

• Flooding and water damage: When the float switch fails, the pump may not activate, so your basement could flood during heavy rain. This means you’ll have water damage on walls, flooring, and everything else in your basement. 

• Sump pump damage: If the switch gets stuck in the “on” position, it can cause the pump to run continuously, leading to motor burnout and costly replacements.

• Mold and mildew: If your sump pump can’t do its job to stop moisture buildup, mold and mildew can wreak havoc in your basement

Routine inspections and occasional maintenance can help you detect float switch issues early, reducing the likelihood of severe water damage.

Can I Replace a Sump Pump Float Switch Myself?

Let a professional handle all sump pump repairs. Replacing a sump pump float switch is not as straightforward as it sounds. You may have to work with electrical components, which is dangerous and could be deadly without the proper training. Additionally, improper installation of a new float switch could lead to ongoing sump pump issues, permanent sump pump damage, and water damage to your home or foundation.