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Moderate — basic toolsHigh safety risk — professional recommended

Washing Machine Keeps Filling With Water and Won't Stop

Updated August 10, 20263 min readTime needed: 15–25 minutes
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Short answer: If your washer keeps taking on water beyond its normal fill level, shut off the water supply valves behind the machine first to prevent an overflow, then check the two most common causes: a water inlet valve stuck open, or a water-level pressure switch/sensor that's no longer telling the machine to stop filling.

Common Symptoms

  • Water continues entering the drum well past the normal fill level
  • The machine doesn't progress to wash/agitate because it's still trying to fill
  • Water may be at risk of overflowing the door seal or top of the tub
  • The problem may happen even when the machine is off, if the inlet valve is stuck

Likely Causes

1. Water inlet valve stuck open

The solenoid valve that lets water into the machine can stick open due to mineral buildup or a worn seal, letting water in continuously instead of shutting off when it should.

2. Failed water-level pressure switch or sensor

This component tells the control board when the water has reached the target level. If it fails, the machine never gets the 'stop filling' signal.

3. Blocked or kinked pressure switch air tube

On mechanical water-level systems, a small air tube signals water level via air pressure — if it's kinked, disconnected, or has a small hole, the switch can't read the level correctly.

4. Control board fault

Less commonly, the control board itself can fail to process the water-level signal correctly, continuing to command the inlet valve open.

Safe Checks You Can Do

  • If water is close to overflowing, turn off both hot and cold water supply valves behind the machine immediately — this is the fastest way to stop the situation from getting worse.
  • Unplug the machine once the water supply is off, to stop the cycle entirely while you investigate.
  • Check the air tube (on mechanical water-level systems) for visible kinks, cracks, or a loose connection at either end.
  • Check whether the inlet valve continues running water even with the machine unplugged — this confirms a stuck-open valve rather than a control signal issue.

Step-by-Step Solution

  1. 1

    Shut off the water supply first

    This is the priority action for an overfilling machine — close both hot and cold shutoff valves behind the washer before doing anything else.

  2. 2

    Unplug the machine

    With the water supply closed, disconnect power to stop the current cycle safely.

  3. 3

    Check whether the valve is stuck (test with supply on, machine unplugged)

    Briefly reopen the water supply with the machine unplugged — if water still flows into the machine with no power at all, the inlet valve is stuck open and needs replacing.

  4. 4

    Inspect the pressure switch air tube

    If the valve isn't stuck when unpowered, check the small air tube connecting the tub to the water-level pressure switch for kinks, cracks, or disconnection.

  5. 5

    Reconnect and test cautiously

    Once you've addressed a stuck valve or a damaged air tube, restore water and power and monitor a fill cycle closely before leaving the machine unattended.

What Not to Do

  • Don't leave an overfilling machine running unattended while you investigate — shut off the water supply first.
  • Don't ignore a valve that stays open with the machine unplugged — this means water is flowing purely from mechanical failure and will keep happening until replaced.
  • Don't attempt to open or repair the control board yourself.

When to Call a Professional

  • The inlet valve is confirmed stuck open and needs replacing.
  • The pressure switch or its air tube is damaged and needs a new part.
  • You suspect a control board fault rather than a valve or sensor issue.
  • The machine has already overflowed and you're unsure if any electrical components got wet.

Safety warning

An overfilling washing machine is a real water-damage risk. Shut off the water supply valves immediately if you notice this happening, and unplug the machine before it has a chance to overflow onto the floor near any electrical outlets.

Frequently Asked Questions

What should I do first if my washer is actively overflowing?

Shut off the water supply valves behind the machine immediately — this stops the immediate risk. Unplug the machine once the water is off, then investigate the cause once things are stable.

Can a stuck inlet valve happen even when the washer isn't running?

Yes — a valve stuck open by mineral deposits or a worn seal can let water trickle or flow in even with the machine off, which is why testing with the machine unplugged is an important diagnostic step.

Is this the same as the machine just taking a long time to fill?

No — a slow fill (often from low water pressure or a clogged inlet screen) still stops at the correct level. This issue is specifically about the machine never stopping the fill at all, which is a different and more urgent problem.

Home Solutions Editorial Team

Reviewed against manufacturer documentation. Updated August 10, 2026. How we write guides

Sources & Further Reading

  • Check your washer's manual for the exact inlet valve and pressure switch locations, since they vary by brand and model.

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