What many people don’t realise is that a small component known as a ‘float switch’, works to control how and when a sump pump operates. 

A sump pump float switch detects the water level inside the sump pit. It works to turn the pump on or off. The benefit is that your pump will only run when required, which will save energy and prevent premature wear and tear. 

Why should I invest in a float switch for sump pump?

It’s not recommended to use a sump pump system without a float switch. Why? Because your sump pump won’t know when to switch on.  

How does a float switch on a sump pump work? 

When the water level in the pit rises, the floating component rises in sync. 

Once the water hits a certain level, the float switch kicks the pump into gear. Excess water is then carried away through a discharge pipe. When the water level lowers again, the float also dips and the pump turns off.  

Where is the sump pump float switch? 

The sump pump float switch is either located inside the sump pit or externally. But it does depend on the type of switch you have.  

Some of the most common types include:  

• Vertical float switches: This type is built with a float that moves up and down along a rod. They’re best for shallower sump pits with space constraints. 

• Tethered float switches: These use a hollow float with a metal ball inside that’s connected to the pump by a cord. As the water rises, the float tilts and the ball moves, which turns on the pump.  

• Electronic or pressure switches: Built directly into the pump with no moving parts. They work by sending a small electrical current through probes. When the probes touch water, the circuit is completed and the pump is then triggered.  

You can browse our wide range of float switches here at Sumps & Pumps.  

How to adjust a sump pump float switch 

It’s always best to adjust your sump pump regularly.  

If the float’s set too high, the water level may rise before the pump kicks in. The risk is that flooding may occur. If it’s set too low, the pump may turn on and off irregularly and cause the motor to break down. 

Here’s a step-by-step guide on how to adjust your switch:

Firstly, disconnect the sump pump for electrical safety. 

Next, find the float switch inside the sump pit. Its location may vary depending on the type of switch you have (as we have discussed in the section above). 

On some switches, you may need to set the activation point higher. This means the pump will only activate when the water reaches a specific point. For tethered float switches, a shorter cord will activate the pump sooner. However, a longer cord allows the water to rise before the pump kicks in.  

Finally, plug the sump pump back in. Then, slowly fill the sump pit with water and check that it’s activating at the correct levels.  

Find out more about float switches today 

If you’d prefer to speak to a professional about the variations of pump float switches, then get in touch. If you’re a beginner to sump pumps and accessories, we’ll happily give you all the guidance you need to have your basement fully protected with our range of products.