Lg Washer Dryer: water hammer

Professional Repair Guide

What is this symptom?

Experiencing loud banging or knocking noises from your LG Washer Dryer during water fill cycles? This common issue, known as water hammer, is caused by rapid shifts in water flow, not mechanical vibrations. It can be felt through walls and pipes, indicating potential plumbing concerns that need addressing.

Urgency: Medium

Important Tips for Lg Models

  • LG official troubleshooting focuses on vibration and noise from unbalanced loads or internal shock absorbers, not specifically water hammer in plumbing. No LG manufacturer guidance specific to water hammer found.

Possible Causes

Hydraulic shock due to rapid shutoff of water flow

How to Identify: Loud banging or knocking aligned with start/stop of water fill cycles, vibration in pipes, not correlated with drum spin

Part: Home plumbing water supply lines and washer solenoid valves

Loose or inadequately secured pipes

How to Identify: Noise accompanied by visible or audible pipe rattling against walls/joists, especially near washer

Part: Plumbing supports/pipe straps

Lack of or failed water hammer arrestor/air chamber

How to Identify: Persistent banging after other fixes; absence of arrestor hardware at supply valves

Part: Water hammer arrestors or air chambers on supply lines

DIY Solutions

Install Water Hammer Arrestors

Moderate 30–60 minutes
Tools Needed: adjustable wrench, Teflon tape
  1. Shut off water supply and unplug washer
  2. Disconnect hot/cold supply hoses from washer valves
  3. Thread water hammer arrestors onto shut-off valves
  4. Reattach supply hoses to arrestors, tighten connections
  5. Turn water supply back on and test washer for noise
⚠️ Safety First: Turn off water before disconnecting hoses

Secure Loose Pipes

Easy 30–90 minutes
Tools Needed: pipe clips or cushioned straps, screwdriver or drill
  1. Identify noisy pipes by feeling or listening during a wash cycle
  2. Add pipe clips/straps to secure loose sections to framing
  3. Ensure pipes are snug but not constricted
  4. Test by running the washer to confirm reduction in noise
⚠️ Safety First: Avoid overtightening clamps on pipes

Adjust Water Pressure to Recommended Range

Moderate 30–60 minutes
Tools Needed: water pressure gauge
  1. Attach pressure gauge to a laundry or outdoor spigot
  2. Measure static water pressure
  3. If above ~60–80 psi, adjust pressure regulator (if present) or consult a plumber
⚠️ Safety First: If unsure, consult professional to adjust pressure regulator

Professional Repairs

Install In‑Line or Whole‑House Water Hammer Arrestors

Estimated Cost: $150 - $400

Replace Faulty Supply Valves or Slow‑Closing Valves

Estimated Cost: $100 - $300 (parts/labor)

When to Call a Professional

Water hammer persists after DIY fixes
Visible leaks, water damage, or pipe movement after banging
Inaccessible plumbing requiring opening walls or complex installations

Preventive Maintenance

  • Inspect and tighten plumbing connections: Loose pipe movement that can amplify water hammer
    Frequency: annually
  • Replace washing machine supply hoses every 3–5 years: Weak hoses and connections that may transmit pressure shock
    Frequency: annually check condition

Frequently Asked Questions

Why is my LG Washer Dryer water hammer?
Common causes include hydraulic shock from rapid water flow shutoff, loose pipes, or a failed water hammer arrestor.
How do I fix LG Washer Dryer water hammer myself?
You can install water hammer arrestors, secure loose pipes, or adjust water pressure to recommended levels.
How much does it cost to fix water hammer?
Professional repairs range from $100 to $400 depending on whether you need valve replacements or in-line arrestors.
When should I call a technician for water hammer?
If DIY fixes don’t resolve the issue or if you suspect major plumbing problems, it’s best to consult a professional.

References & Sources

Community Analytical Insights

Analysis based on real user discussions from appliance repair communities

Can I Fix This Myself?

70%
DIY Success Rate Difficulty: Either

Common Issues Reported by Users

  • High water pressure in the plumbing system
  • Loose or improperly secured water supply lines
  • Faulty or worn-out inlet valves in the washer dryer

User Suggested Solutions

  1. Check and adjust the water pressure. Use a pressure gauge to measure the water pressure and adjust it to the recommended level (typically between 40-60 psi).

  2. Inspect and secure the water supply lines. Ensure that the hoses are tightly connected and use pipe straps to secure them to the wall or floor to minimize movement.

  3. Replace the inlet valves if they are faulty. Turn off the water supply, disconnect the hoses, and replace the inlet valves with new ones if they show signs of wear or damage.

Analysis based on 1 community discussions
View Sources

Data compiled from real discussions on r/appliancerepair and r/Appliances:

  1. Water hammer - nothing fixes

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