Dishwasher Float Switch

Dishwasher Float Switch


The dishwasher float switch is a crucial safety component in a dishwasher repair that helps prevent overfilling of the dishwasher’s tub with water. It is a simple yet effective mechanism that ensures the dishwasher does not flood due to an excessive inflow of water. Here’s how the dishwasher float switch works and its role in the dishwasher’s operation:


  1. Water Level Control: The primary function of the dishwasher float switch is to monitor the water level inside the dishwasher’s tub and control the operation of the water inlet valve. It prevents the dishwasher from filling with water beyond a safe level.

Features and Characteristics:

  • Float: The float is a buoyant device, often shaped like a small plastic or foam disk or a hollow cylinder. It is typically located in the front corner of the dishwasher’s tub, near the bottom.
  • Float Stem: Attached to the float is a stem or lever that extends upward. As water enters the dishwasher tub, the float rises with it, guided by the stem.
  • Switch or Sensor: Connected to the float assembly is a microswitch or sensor. When the float rises to a certain height due to the increasing water level, it triggers the microswitch or sensor.


  1. Fill Phase: When you start a dishwasher cycle, the water inlet valve opens to allow water to enter the dishwasher tub. Initially, the float is in its lowest position.
  2. Rising Water Level: As water continues to flow into the dishwasher, the float rises along with it. The stem attached to the float pushes against the microswitch or sensor.
  3. Switch Activation: When the water level inside the dishwasher reaches a predetermined safe level, the float rises high enough to activate the microswitch or sensor.
  4. Water Inlet Valve Shutoff: The activation of the microswitch or sensor signals the dishwasher’s control board to close the water inlet valve. This action stops the flow of water into the tub, preventing overfilling.

Maintenance and Care:

  1. Cleaning: Periodically inspect the float, stem, and the area around them for debris, food particles, or mineral buildup that may interfere with the float’s movement. Clean these components as needed to ensure they can function properly.
  2. Proper Operation: During a dishwasher cycle, listen for any unusual sounds, such as a continuously running water inlet valve. If you suspect an issue with the float switch or water level control, address it promptly to prevent overfilling.
  3. Check for Leaks: If you notice water leaking from the dishwasher, the float switch or related components may be involved. Investigate and address any leaks immediately.
  4. Safety Precautions: Before performing any maintenance or repairs on your dishwasher, disconnect the power supply and turn off the water supply to the appliance for safety.

The dishwasher float switch is a crucial safety feature that helps prevent potential water damage caused by overfilling. Proper maintenance and care of this component are essential to ensure the dishwasher operates safely and efficiently. If you suspect a problem with the float switch or water level control, consult your dishwasher’s user manual or seek professional appliance repair assistance.


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