Function of the Water Level Sensor in an Automatic Washing Machine

The water level sensor is an important part of an automatic washing machine. Its main function is to detect how much water is inside the washing tub and help the machine fill it to the correct level

Main functions

1. Controls water filling: It signals the control board when the required water level is reached.
2. Prevents overfilling: It helps stop the water inlet valve from allowing too much water into the tub.
3. Controls washing operation: It helps the machine determine when enough water is available to begin washing.
4. Saves water: It helps adjust the amount of water according to the selected program and load, depending on the machine model.
5. Supports rinsing: It helps regulate water filling during rinse cycles.

How does the sensor work?

1. Water enters the tub

As the water level rises, air pressure increases inside the pressure chamber and connected hose.

2. The sensor detects pressure

The sensor converts the pressure into an electrical signal or switches its contacts.

3. Water filling stops

The control system receives the signal and closes the water inlet valve when the target level is reached.

What happens if the water level sensor becomes faulty?

• The machine may overfill with water.
• The machine may not take in enough water.
• Washing may not start.
• The machine may keep filling or show an error code.

Important safety tip: If your washing machine keeps filling and does not stop, turn off the water supply and unplug the machine if it is safe to do so. A blocked pressure hose, faulty sensor, inlet valve, or control board may be responsible.

Tell me one thing: Is your automatic washing machine a top-load machine or a front-load machine? I can explain the sensor’s working and testing method for your type.