LG Washer Dryer: water hammer
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.
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
- Shut off water supply and unplug washer
- Disconnect hot/cold supply hoses from washer valves
- Thread water hammer arrestors onto shut-off valves
- Reattach supply hoses to arrestors, tighten connections
- Turn water supply back on and test washer for noise
Secure Loose Pipes
- Identify noisy pipes by feeling or listening during a wash cycle
- Add pipe clips/straps to secure loose sections to framing
- Ensure pipes are snug but not constricted
- Test by running the washer to confirm reduction in noise
Adjust Water Pressure to Recommended Range
- Attach pressure gauge to a laundry or outdoor spigot
- Measure static water pressure
- If above ~60–80 psi, adjust pressure regulator (if present) or consult a plumber
Next step
Choose the next step for water hammer
Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.
Browse by model — no specific failed part is claimed
Model-compatible Washer Dryer parts
Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.
Where can I find the model number?
Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.
Search results are not a diagnosis. Verify both the complete appliance model and the retailer's fit information before ordering.
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Optional routine care
Maintenance supplies
These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.
Dryer Vent Cleaning Kit
Helps remove routine lint buildup from an accessible dryer vent path. It does not diagnose or repair an E-code or failed component.
Lint Trap Cleaning Brush
A narrow brush for routine cleaning around an accessible lint screen and housing.
Dryer Vent Hose Kit
A replacement exhaust duct option for visibly crushed or damaged external venting. Check diameter, length, local code, and installation clearance.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.
Professional Repairs
Install In‑Line or Whole‑House Water Hammer Arrestors
Replace Faulty Supply Valves or Slow‑Closing Valves
When to Call a Professional
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?
How do I fix LG Washer Dryer water hammer myself?
How much does it cost to fix water hammer?
When should I call a technician for water hammer?
References & Sources
- Water Hammer Noise - How to Fix Community
Community Analytical Insights
Guidance from available sources; statistical claims are shown only for samples of at least 10 discussions
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
-
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).
-
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.
-
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.
Limited-source guidance; percentages and success-rate claims are not shown
View
Sources
Data compiled from real discussions on r/appliancerepair and r/Appliances:
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