Pipes noisy when washing machine fills

Quick Answer:

If you hear pipes noisy when washing machine fills, it’s often caused by water rushing, a valve closing, or vibration in the supply lines. Run the washer through the cycle that makes the sound and check whether the noise comes from a hose, a valve, or farther inside the walls. If the sound traces to inaccessible piping or built-in systems, a plumber can isolate and fix it safely.

Why This Happens

• Rapid flow during the fill phase can create pressure changes and vibration in pipes or loose fittings.
• A closing solenoid or fill valve in the machine can cause a short loud shutoff sound when it stops water flow.
• Loose or unsecured supply lines and fittings can transmit vibration into framing, producing a banging or rattling sound.
• Shared plumbing or integrated devices (water softeners, booster pumps) can react when the washer calls for water, creating noise that seems to come from the piping system.
• Compare the sound to other systems — you may hear similar noise from the dishwasher or outdoor lines when they run. For example, check Noise when dishwasher runs or Noise when sprinkler system starts for similar causes and fixes.

Step-by-Step What to Do

1. Run the appliance cycle that triggers the noise

• Start a wash that will reach the point where the noise usually happens (typically the fill or drain phases).
• Have someone else run the cycle if you need to move around the laundry area to check things.

2. Listen for the exact phase (fill, drain, shutoff)

• Note whether the noise happens during fill, while the pump drains, or right when the valve closes. Each phase points to different causes.
• Write down the timing so you can report it clearly if you call a pro.

3. Touch nearby supply lines to feel vibration

• Carefully feel the hot and cold hoses and any exposed copper or plastic pipes while the washer is filling.
• Vibration in a specific line helps localize the source; loose clamps or fasteners are often the culprit.

4. Compare with other appliance cycles

• Run the dishwasher or an outdoor irrigation cycle and listen for similar noises to help determine whether the problem is isolated to the washer or affects the whole plumbing system.
• That comparison helps you decide whether the issue is a local connection or a system-wide pressure/valve problem.

5. Simple checks you can do safely

• Tighten visible hose clamps and the washer inlet hoses at the back of the machine. Do not overtighten plastic fittings.
• Place a hand against cabinets or framing to see where vibration transfers — adding cushioning or re-securing a loose strap can sometimes quiet things.
• If you have a pressure-reducing valve or whole-house device, note whether its noise matches the washer’s timing; do not attempt to open or adjust those devices yourself unless you are qualified.

What Not to Do

• Don’t disassemble appliances or bypass safety devices to chase sounds — this can damage the machine or create safety hazards.
• Don’t open or modify built-in water treatment equipment, booster pumps, or pressure-reducing valves yourself; those systems may need professional calibration.
• If the noise is tied to built-in systems like softeners or pumps, have a plumber diagnose it properly rather than attempting DIY fixes that could void warranties or cause leaks.

When to Call a Professional

• If the noise comes from inside walls or an inaccessible chase and you cannot safely trace it to a loose clamp or hose.
• Persistent loud hammering, banging, or high-pitched whining that doesn’t improve after basic checks.
• Signs of water pressure issues, repeated valve failures, or any leakage near fittings or the machine.
• When the sound is linked to integrated equipment (softener, pump, pressure regulator) — a plumber can isolate the component and test system pressure safely.

Safety Notes

• Turn off the washer and unplug it before touching hoses or electrical parts.
• If you need to shut off water, use the machine’s inlet valves or the home shutoff for that branch of plumbing; know where your main shutoff is before you start work.
• Avoid working on pressurized devices or internal appliance parts unless you have the proper training.
• If you smell gas, see significant leaks, or detect structural movement, stop and call a professional immediately.

Common Homeowner Questions

• Q: Is this normal?
  A: Short noises during fill or valve shutoff can be normal, but persistent banging or vibration is not and should be checked.
• Q: Can I fix it myself?
  A: You can try tightening visible hoses and securing loose lines; anything inside walls or tied to built-in systems needs a pro.
• Q: Will noisy pipes damage the washer or plumbing?
  A: Ongoing hammering or vibration can stress fittings and connections, so address persistent noise to avoid future damage.

For more related articles, see the Noises Only When Appliances Run hub.