How to Fix a Washer That Won't Stop Filling With Water

A washer that won’t stop filling can flood your laundry room fast. Household water damage claims from washing machines average more than $5,300 per incident, according to the Insurance Information Institute. Act immediately: unplug the machine, shut off the water supply, then work through this guide. Most causes come down to a handful of components you can inspect yourself.

Quick Fix: What to Do Right Now

1. Unplug the machine. Cut power at the wall to eliminate electrical hazards.
2. Shut off the water supply. Find the valve or valves behind the machine and close them, even if unplugging stopped the flow.
3. Drain the drum. If there is no leak, plug the machine back in and run a drain or drain-and-spin cycle with the supply valves still closed. If you cannot run a cycle, bail or siphon the water out manually.
4. Troubleshoot or call a pro. Once the drum is empty, work through the steps below.

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Why Is My Washer Still Filling With Water?

Overfilling is among the most common problems with washing machines, partly because the issue can stem from a variety of causes.

• Malfunctioning water inlet valve. A washing machine has an inlet valve that is designed to close when enough water has filled the drum. This valve can get stuck in the open state if there’s a mechanical failure or blockage.   
   
• Faulty water level switch. Many washing machines feature switches that are responsible for signaling when to shut off the water. If this switch fails, water can continue to pour into the drum.   
   
• Clogged or kinked pressure hose. Washing machines regulate water levels with a pressure hose (or air dome tube) that connects the drum to the air dome. As water in the drum increases, the air pressure inside the hose also increases, eventually triggering the water level switch. Clogs or kinks can interfere with the pressure within the hose, keeping it from triggering the switch.   
   
• Poor water pressure. Low water pressure may interfere with the mechanical operation of the inlet valve, allowing water to continue trickling into the drum.   
   
• Electronics failure. Faulty control boards and timers may be responsible for overfilling problems, particularly in older models.

Step-by-Step Troubleshooting

Some Samsung and LG models display an OF or oF error code when overfill is detected. Check your manual to confirm the code before troubleshooting. If the drum is overflowing, do not reach inside; shut off the water supply first.

To fix a washer that won’t stop filling, work through these steps in order.

1. Unplug the washing machine. If water continues to fill your washing machine even after you have pulled the plug, the water inlet valve is likely stuck in the open state.
2. Shut off the washing machine’s water supply at the valves behind the machine. Always unplug the washer and shut off both water valves before inspecting internal components.
3. Inspect the inlet valve. If cutting the power did not stop the flow, examine the valve at the rear of the machine. Check the filter screen for debris and mineral buildup. Look for obstructions or a loose seal.
4. Check the pressure hose. Disconnect it carefully, look for kinks or cracks, and blow through it to confirm unobstructed airflow. Clean with a pipe cleaner and diluted warm vinegar if needed, or replace it.
5. Test the water level pressure switch. Connect one end of the pressure hose to the switch and blow into the other end. You should hear a click when the switch engages. Set your multimeter to continuity mode and test the switch terminals; a failed switch will show no continuity. Replace the switch if it fails.
6. Examine the air dome for cracks or wear. Replace it if damaged.
7. Check the drain pump filter. Clean out any lint, coins, or debris from the filter housing at the front base of the machine.
8. Verify drain hose position. Confirm the hose extends no more than 4.5 inches into the standpipe and is not sealed in place.
9. If all components check out, suspect an electrical issue with the control board. Contact a professional at this point.

When to Check the Water Inlet Valve

Many inlet valves are mechanical and do not need an electrical signal to close. If water continues to fill the drum when the unit is unplugged from a power source, that is a strong indication the inlet valve is faulty.

Signs of a failing water inlet valve:

• Water continues filling after unplugging the machine
• Only hot or only cold water enters the drum
• Slow fill followed by a continuous trickle after the cycle should have stopped
• Humming sound during the fill cycle
• Visible mineral buildup or debris on the valve screen

Testing the Water Level Pressure Switch

You can check the water level switch by detaching the pressure hose and blowing into the end connected to the switch. If you hear a click, the switch is likely functional. If there is no click, the switch has probably failed.

Confirm the result with a multimeter: set it to continuity mode and test the switch terminals. A working switch will show continuity when triggered; a failed switch will show none. Replace the switch if it does not click or fails the continuity test.

Top Load vs. Front Load: Does the Type Matter?

The core causes of overfilling are the same across machine types, but the components differ slightly.

Top load washers most commonly use a mechanical pressure switch connected to an air dome tube. When a top load washer won’t stop filling, the pressure switch or its hose is the first place to look. Access to these components is typically straightforward from the top or rear panel.

Front load washers more commonly use electronic pressure sensors. These sensors are more precise but can also fail in ways that are harder to diagnose without error codes. Check for an OF or oF error code on Samsung and LG models, or consult your manual for equivalent codes on other brands.

The troubleshooting steps in this guide apply to both types. Access points and component locations vary; consult your owner’s manual or model-specific documentation for exact locations.

Final Fixes & When to Call a Professional

If you’ve already gone through the troubleshooting guide and still have a washing machine filled with water, try running a drain-and-spin cycle. Otherwise, you may need to bail the water out with a bucket or use an emergency siphon.

Contact a professional if you suspect an electrical issue. You should also call a technician if you see water leaking from the appliance and onto the floor. That suggests you’re up against a washing machine drain overflow, which can be complicated to resolve.

You can stay ahead of overfilling and other problems by keeping up with regular maintenance tasks. Periodically clean your washing machine and inspect the component parts for wear and tear. But if a malfunction does arise, take advantage of home warranty coverage to save on your repair bill. Learn more about Liberty Home Guard’s appliance coverage by calling (833)-545-3434.