March 13, 2026

You start a wash cycle and walk away, then come back to find the tub overflowing or water still running long after it should have stopped. A Samsung top load washer that keeps filling without shutting off is not just frustrating, it can waste a significant amount of water and cause flooding if left unchecked.

The filling process in any top load washer depends on a chain of parts working together: a valve that opens to let water in, a sensor that monitors how much water has entered, a hose connecting those two parts, and a control board that coordinates the whole sequence. When any one of these fails, the machine loses its ability to know when to stop. This guide explains exactly what causes continuous filling on Samsung top load washers and takes you through the diagnostic steps and fixes for each cause.

Before You Begin: Safety First

Overfilling is an active water emergency. Follow these steps before doing anything else:

1. Turn the washer off using the power button.

2. Reach behind the machine and turn off both the hot and cold water supply valves at the wall. Turning these valves clockwise closes them.

3. Unplug the washer from the wall outlet. Never work on the machine with power connected.

4. If water has already overflowed onto the floor, place towels or a shallow pan to catch any residual dripping before you begin the inspection.

Common Causes of a Samsung Washer That Won't Stop Filling

Here is a quick overview of the most frequent reasons a Samsung top load washer keeps filling. Each cause is covered with full diagnostic steps in the sections below.

• Defective Water Inlet Valve: The valve that admits water into the tub can fail mechanically, causing it to remain partially or fully open even when the control board sends the signal to close. This is the most common cause of continuous filling.

• Blocked or Kinked Pressure Sensor Hose: A small rubber hose connects the tub to the water level sensor. If this hose is pinched, clogged with mineral deposits, or has pulled loose from either connection point, the sensor cannot detect the rising water level and the valve stays open.

• Faulty Water Level Pressure Switch: The pressure switch reads the air compression in the sensor hose to determine how full the tub is. A failed switch sends no stop signal to the control board, so filling continues indefinitely.

• Drain Hose Siphoning: If the drain hose is inserted too deeply into the standpipe or positioned too low, it creates a continuous siphon that drains water out as fast as the inlet valve brings it in. The machine never reaches the target water level and keeps filling trying to catch up.

• Failed Main Control Board: In less common cases, a shorted or damaged circuit on the control board can hold continuous voltage on the water inlet valve, keeping it open regardless of what the pressure switch reports.

• Clogged Inlet Valve Filter Screens: Small mesh screens inside the valve inlets catch sediment from the water supply. Heavy buildup can cause erratic valve behavior and in some cases prevent the solenoid from closing fully.

Quick Test: Is the Problem the Valve or the Control Circuit?

This one test immediately tells you whether the water inlet valve itself is the problem or whether the electrical circuit controlling it is to blame. Run it before inspecting any other component.

1. Start a wash cycle and wait until the overfilling behavior begins.

2. Unplug the washer from the wall outlet while the water is still running.

3. Watch the water inlet for 30 to 60 seconds.

4. If water continues to flow after unplugging: the inlet valve has a mechanical failure. The solenoid is stuck open and the valve must be replaced regardless of what the electrical circuit does.

5. If water stops immediately after unplugging: the valve itself is physically fine. The problem lies in the electrical control circuit — the pressure switch, the pressure hose, or the main control board is sending a constant signal to keep the valve open.

Fix 1: Inspect and Replace the Water Inlet Valve

The water inlet valve on a Samsung top load washer typically contains two or three solenoid coils, one each for hot water, cold water, and sometimes a recirculation or pre-wash line. If any solenoid fails in the open position, water enters the tub continuously without any signal from the control board.

How to Locate and Inspect the Valve

1. Ensure the water supply valves at the wall are closed and the washer is unplugged.

2. Pull the washer away from the wall to access the rear panel.

3. Remove the screws securing the rear access panel and set it aside.

4. The water inlet valve is mounted at the top rear of the machine where the two supply hoses from the wall connect. It is usually held in place by one or two screws.

5. Disconnect the inlet hoses from the valve fittings. Have a towel ready for residual water.

6. Examine the small mesh filter screens inside each hose fitting port on the valve. If screens are heavily coated with sediment or scale, clean them carefully with a soft brush and warm water. Do not use anything sharp, as screens that are torn or punctured require a full valve replacement.

7. Look over the valve body for cracks, corrosion, or any visible signs of damage.

How to Test the Valve Solenoids with a Multimeter

1. Disconnect the wire harness connectors from the valve solenoid terminals.

2. Set your multimeter to the Rx1 resistance setting.

3. Touch the probes to the two terminals of each solenoid coil in turn.

4. A working solenoid will read between 200 and 500 ohms depending on the model. Refer to your Samsung model's service manual for the exact expected range.

5. A reading of zero ohms (dead short) or infinity (open circuit) means that solenoid coil has failed and the entire valve assembly must be replaced.

6. Even if the solenoids test within range, if the mechanical valve body showed water flowing after unplugging in the earlier test, replace the valve. The solenoid may read correct resistance while still failing to physically close.

How to Install a Replacement Valve

1. Purchase a genuine OEM water inlet valve matched to your exact Samsung model number. The model number sticker is located inside the lid of the washer.

2. Mount the new valve in the same position as the old one and secure it with the original screws.

3. Reconnect the wire harness connectors to the solenoid terminals. Match the connector positions to the original layout.

4. Reattach the inlet hoses and tighten the fittings by hand until snug, then an additional quarter turn with pliers.

5. Reinstall the rear panel, turn the water supply back on, and run a test cycle to confirm the filling stops at the correct water level.

Fix 2: Check and Clear the Pressure Sensor Hose

The pressure sensor hose (also called the air dome tube) is a narrow rubber or clear plastic hose that runs from a port at the bottom side of the outer tub up to the water level pressure switch. As the tub fills, water compresses the air inside this hose, and that compressed air pushes against a diaphragm in the switch. If the hose has a blockage, a kink, or a loose connection at either end, the pressure never builds correctly and the switch never receives the signal that the tub is full.

How to Inspect the Pressure Hose

1. With the washer unplugged, open the top lid and look along the inside walls of the cabinet for the pressure hose. On most Samsung top load models it runs up the left or right side from a small port near the base of the tub to the pressure switch behind the control panel area.

2. Trace the full length of the hose and look for any sharp kinks, pinch points, or areas where the hose has been compressed against the cabinet wall.

3. Check both ends of the hose. A hose that has pulled free from either the tub fitting or the pressure switch port will prevent any air pressure from building.

4. If the hose appears intact, disconnect it at both ends and hold it up to a light source to look for any debris or scale buildup blocking the interior. You should be able to see clearly through the length of the hose.

5. Blow gently through one end of the disconnected hose. Air should pass through freely with no resistance.

How to Test the Hose for Air Leaks

1. Plug one end of the hose firmly with your finger.

2. Submerge the hose in a bowl of water.

3. Blow into the open end. If bubbles appear anywhere along the hose, it has a crack or pinhole that prevents pressure from building in the switch.

4. A hose that leaks air cannot be reliably patched. Replace it with an OEM hose matched to your Samsung model.

How to Clear a Blocked Hose

1. Disconnect the hose at both ends.

2. Run warm water through the hose from a tap to flush out any loose debris.

3. For mineral scale deposits, soak the hose in a mixture of equal parts white vinegar and warm water for 30 minutes, then flush again.

4. Reconnect both ends firmly, making sure each connection seats fully over its port. A loose fit is enough to break the air seal.

5. Run a test cycle and observe whether the water level now stops at the correct point.

Fix 3: Diagnose and Replace the Water Level Pressure Switch

Once the pressure hose has been confirmed clear and properly connected, the next item to test is the pressure switch itself. This component uses the air pressure from the hose to trigger an internal diaphragm that opens or closes an electrical contact. When the contact closes, it signals the control board to cut power to the water inlet valve. A switch whose diaphragm has cracked or whose internal contacts have burned out will never send that stop signal.

How to Locate the Pressure Switch

1. On Samsung top load washers, the pressure switch is typically located behind the control panel at the top of the machine or mounted on the inner cabinet wall near where the pressure hose terminates.

2. To access it, remove the screws at the rear of the control panel top trim. The panel usually tilts forward or lifts away to reveal the components behind it.

3. The pressure switch is a round disc-shaped component with a rubber hose port on one side and an electrical connector on the other.

How to Test the Pressure Switch

1. Disconnect the pressure hose and the wire connector from the switch.

2. Set your multimeter to continuity mode.

3. Touch the probes to the switch terminals. With no air pressure applied, the switch should be in its default open or closed state depending on the terminal pair being tested. Refer to your model's wiring diagram for expected states.

4. Blow a short breath directly into the hose port on the switch. A working switch will audibly click and change its continuity reading as the diaphragm activates.

5. If the switch does not click or the multimeter reading does not change when you blow into the port, the diaphragm or contacts inside the switch have failed.

6. Replace the pressure switch with an OEM part matched to your Samsung model number.

Fix 4: Correct Drain Hose Position to Stop Siphoning

This is one of the most frequently misdiagnosed causes of continuous filling because it looks exactly like an overfill problem when it is actually a draining problem. A drain hose that creates a siphon pulls water out of the tub constantly. The water level never climbs high enough to satisfy the pressure switch, so the inlet valve keeps opening to compensate. The tub appears to never fill, or fills very slowly while still running the inlet valve continuously.

1. Pull the washer away from the wall and locate the drain hose at the rear of the machine.

2. Follow the hose to where it enters the standpipe or connects under the sink.

3. Check insertion depth: the hose should extend no more than 6 to 8 inches into the standpipe opening. If it goes deeper, pull it back out to the correct depth and secure it with a cable tie or hose clip to prevent it from sliding back in.

4. Check hose height: the drain hose outlet must be positioned between 24 and 48 inches above the floor. If the outlet sits lower than 24 inches, siphoning will occur. Use the hose guide or hook that came with the washer to hold the hose at the correct height against the standpipe.

5. Make sure the hose is not pressed flat against the wall or kinked at any point, as restrictions can also interfere with the pressure balance inside the drain system.

6. After repositioning, run a test cycle and check that the tub fills to the correct level and holds that level during the wash phase without continuous refilling.

Fix 5: Inspect the Main Control Board

If the water inlet valve passes its multimeter test, the pressure hose is clear and sealed, the pressure switch clicks and changes state correctly, and the drain hose is properly positioned, the remaining suspect is the main control board. A board fault that causes continuous filling is typically a shorted relay or transistor that holds the water inlet valve circuit in the energized state regardless of what the pressure switch reports.

1. Unplug the washer completely before accessing the board.

2. Access the control board by removing the control panel trim screws at the rear of the top panel and tilting the panel forward. On some Samsung models the board is located behind a separate panel at the rear top of the cabinet.

3. Examine the board surface carefully under good lighting. Look for darkened or burnt areas around any component, swollen or leaking capacitors (these will appear bulged at the top rather than flat), or corrosion on the connector pins.

4. Check that all wire harness connectors are fully seated into the board. A partially disconnected connector can cause unpredictable control behavior.

5. If any component on the board shows visible physical damage, the board should be replaced. Control board repair is not practical for home repairs.

6. Order a replacement board using your Samsung model number. Verify the part number printed on the existing board matches the replacement before installing.

Samsung Washer Error Codes Related to Filling

If your Samsung top load washer displays an error code during or after an overfill event, use this reference to understand what the machine is reporting.

If no error code appears despite continuous filling, the problem is most likely the pressure switch or hose, since these faults often prevent the machine from detecting that anything is wrong.

Troubleshooting Quick Reference

Match your symptom to the most likely starting point for your repair.

• Water keeps running after unplugging the washer: Replace the water inlet valve. The solenoid is stuck open mechanically.

• Water stops when unplugged but runs continuously during a cycle: Start with the pressure switch hose and pressure switch. Then check the control board.

• Tub fills very slowly but inlet valve never closes: Check for siphoning at the drain hose. Verify hose depth and height at the standpipe.

• Error code 4E or 4C showing: Clean the inlet valve filter screens and verify the water supply valves are fully open.

• Tub overfills and then shuts off at a very high level: The pressure switch is reading late. Test the hose for blockage and the switch for correct activation pressure.

• No error code, machine fills and never stops: Test the pressure switch first. If it passes, inspect the control board for a shorted relay.

How to Prevent Overfilling Problems in the Future

• Install a washing machine flood stop hose set between your wall supply valves and the washer. These automatically cut off water flow if a hose bursts or the pressure changes abnormally.

• Clean the water inlet valve filter screens once a year, or more often if you have hard water. Turn off the supply valves, disconnect the hoses, and rinse the screens under running water.

• Inspect the pressure hose annually for cracking or stiffness. Rubber hoses degrade over time and a hose that feels brittle should be replaced before it fails.

• Keep the drain hose secured at the correct height using the guide clip provided with the washer. Check that it has not slipped deeper into the standpipe after the machine has been moved for cleaning.

• Use a surge protector on the washer outlet to protect the control board from voltage spikes, which are a common cause of relay damage on Samsung boards.