Dishwasher Float Bulb

Dishwasher Float Bulb

The dishwasher float bulb, also known as the float switch or float assembly, is an important component of a dishwasher’s water management system. It helps monitor and control the water level inside the dishwasher’s tub during the wash and rinse cycles. Here’s how the dishwasher float bulb works and its role in the dishwasher’s operation:


  1. Water Level Control: The primary function of the dishwasher float bulb is to control the water level inside the dishwasher’s tub. It helps prevent overfilling by shutting off the water inlet valve when the desired water level is reached.

Features and Characteristics:

  • Float Bulb: The float bulb is a hollow, buoyant bulb-shaped object made of plastic or a similar material. It’s typically located at the bottom of the dishwasher’s tub.
  • Float Stem: Attached to the float bulb is a stem or lever that extends upward. As the water level rises in the dishwasher, the float bulb rises with it, guided by the stem.
  • Microswitch or Sensor: Connected to the float assembly is a microswitch or sensor that detects the position of the float bulb. When the float bulb rises to a certain height, it triggers the microswitch or sensor, signaling the dishwasher’s control board to stop the flow of water.


  1. Fill Phase: When you start a dishwasher cycle, the water inlet valve opens to allow water to enter the dishwasher tub. As the tub fills with water, the float bulb remains submerged at the bottom.
  2. Rising Water Level: As water continues to flow into the dishwasher, the float bulb rises with it. The stem attached to the float bulb pushes against the microswitch or sensor.
  3. Water Level Control: When the water level inside the dishwasher reaches the desired level, the float bulb lifts the stem 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, stopping the flow of water into the tub.

Maintenance and Care:

  1. Cleaning: Periodically inspect the float bulb, stem, and surrounding area 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 bulb or water level control, it’s essential to address it promptly to prevent overfilling.
  3. Check for Leaks: If you notice water leaking from the dishwasher, the float bulb or related components may be involved. Investigate and address any leaks immediately.
  4. Safety Precautions: Before attempting any maintenance or repairs on your dishwasher, disconnect the power supply and turn off the water supply to the appliance to ensure safety.

The dishwasher repair float bulb is a simple yet effective mechanism that plays a crucial role in preventing water overfill in the dishwasher. Proper maintenance and care of this component can help ensure the dishwasher operates safely and efficiently. If you suspect an issue with the float bulb or water level control, it’s advisable to consult your dishwasher’s user manual or seek professional appliance repair assistance.


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