septic pump float switch wiring diagram


Septic Pump Float Switch Wiring Diagram: A Comprehensive Guide

As a septic pump owner/operator, ensuring that your system is well-maintained and properly wired is crucial to prevent any mishaps that may lead to costly repairs or even a system-wide failure. One of the most important components of the septic pump system is the float switch, which controls the pump’s operation based on the level of wastewater in the tank. In this article, we will provide a comprehensive guide on the septic pump float switch wiring diagram to help you ensure that your system is wired correctly and functioning at peak efficiency.

What Is a Float Switch?

A float switch is a mechanical device that consists of a float and switch mechanism that is designed to activate or deactivate an electrical circuit. In septic pump systems, the float switch is used to control the operation of the pump based on the level of liquid in the tank. The switch is triggered when the float rises or falls, signaling the need to turn on or shut off the pump.

Types of Float Switches

There are two types of float switches used in septic pump systems:

  • Vertical Float Switches: This type of switch has a float attached to a vertical rod that travels up and down with the level of liquid in the tank.
  • Tethered Float Switches: This switch has a float that hangs from a cord or chain, allowing it to move in a horizontal arc as the liquid level changes.

Both types of switches can be used in septic pump systems. However, tethered switches are more versatile and can be used in tanks with irregular shapes or limited space.

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Wiring the Float Switch

Wiring the float switch correctly is critical to the proper operation of the septic pump system. Here’s a step-by-step guide on wiring your float switch:

  1. Turn off the electrical power to the septic pump.
  2. Remove the cover from the septic pump control box.
  3. Locate the wires from the float switch.
  4. Connect the wires to the pump control box, following the manufacturer’s instructions.
  5. Connect the wires to the pump motor, following the manufacturer’s instructions.
  6. Turn on the electrical power and test the operation of the float switch.

It’s important to follow the manufacturer’s instructions when wiring the float switch to ensure that the system operates correctly and to avoid any safety hazards related to electrical shock or fire.

Troubleshooting Float Switch Issues

If your septic pump isn’t functioning properly and you suspect there may be an issue with the float switch, there are a few things you can check:

  • Make sure the float switch is free to move and not getting stuck on anything.
  • Check the wiring to make sure it’s connected correctly and not damaged.
  • Check the pump control box for any faults or tripped circuit breakers.

If none of these steps resolve the issue, it’s best to contact a professional septic pump service provider to diagnose the problem and provide a solution.


Proper wiring and maintenance of the float switch is crucial to the proper operation of your septic pump system. By following the manufacturer’s instructions and taking the necessary precautions around electrical power, you can ensure that your system operates efficiently and safely.

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