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Your washing machine is supposed to operate smoothly through each cycle—filling, washing, draining, and spinning. But what happens when it doesn’t stop filling with water or continuously drains? One of the most common and often overlooked causes is a failure of the water level sensor, also known as the pressure switch.
What Is the Water Level Sensor and What Does It Do?
The water level sensor is a key component in your washing machine’s operation. Its main job is to detect how much water is inside the drum and to signal the control board to stop filling or initiate draining. It typically works by measuring air pressure through a small hose connected to the drum. As water fills the drum, the air pressure inside this hose increases. Once the appropriate pressure is reached, the sensor sends a signal to stop the water intake.
Signs the Water Level Sensor Might Be Faulty
When the sensor begins to fail or completely malfunctions, the machine gets “confused” about the actual water level. Here are some warning signs:
- Continuous Filling: The washer keeps adding water and doesn’t stop, even when it overflows.
- Never Filling Enough: The drum remains half-empty or barely fills despite being set to a full load.
- Constant Draining: Water drains during the fill cycle or won’t stop draining altogether.
- Cycle Interruption or Reset: The washing cycle might stop or restart mid-process due to incorrect water level detection.
- Error Codes: Some models display specific error codes related to pressure or water level issues.
Why the Sensor Fails
The water level sensor can stop working correctly for several reasons:
- Blocked or Pinched Pressure Hose: If the air hose is clogged with detergent residue or lint, or if it’s kinked, it can’t relay accurate pressure readings.
- Cracked or Leaky Hose: Any air leak in the pressure hose causes incorrect readings, leading the sensor to malfunction.
- Electrical Failure: Loose wires, corroded terminals, or a damaged control board can prevent the sensor from working properly.
- Mechanical Damage: Over time, the internal diaphragm of the pressure switch can wear out and lose accuracy.
- Improper Installation or Repairs: A previously replaced sensor or hose installed incorrectly can lead to premature failure.
Risks of Ignoring the Problem
Ignoring a faulty water level sensor can result in a host of issues, some of which may be costly:
- Flooding and Water Damage: If the washer overfills and floods the floor, it can damage your flooring, walls, or surrounding furniture.
- Waste of Water and Energy: Constant refilling and draining wastes water and energy, increasing utility bills.
- Damage to Other Components: Overworking the drain pump or motor can lead to further breakdowns.
- Interrupted Laundry Cycles: Inconsistent or incorrect water levels mean your laundry isn’t being cleaned properly.
Can You Fix It Yourself?
While basic maintenance like inspecting the pressure hose for clogs or kinks can be performed by most homeowners, diagnosing a faulty water level sensor often requires technical skill. Testing the switch with a multimeter, ensuring hose connections are secure, and accessing the machine’s internal parts should be done with caution.
When to Call a Professional
If your machine keeps filling or draining and basic troubleshooting doesn’t resolve the issue, it’s best to contact a professional. Certified technicians can:
- Run diagnostic tests to identify the problem accurately.
- Check the control board and related wiring.
- Replace the faulty water level sensor or pressure hose.
- Ensure all components are reassembled safely and correctly.
Timely repairs prevent more severe problems and restore your machine’s efficiency.
Keep Your Washer Running Right – Call the Experts
A malfunctioning water level sensor isn’t just a minor inconvenience—it’s a problem that can lead to wasted resources and potential damage to your home. If your washer keeps filling or draining and you suspect a water level sensor failure, don’t wait.
Contact HOME APPLIANCE SERVICE CENTER for fast, reliable, and expert repair services. Our skilled technicians will diagnose the issue, fix it quickly, and help you prevent future breakdowns. Let us restore peace to your laundry routine today!
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