LG WM3670HWA banging noise when the washer fills
Cause 1 of 2Plumbing in the home moves or flexes when the water valves in the washer shut off. This is not caused by a defect in the washer. Source: Troubleshooting: Before Calling for Service, p. 37
First checkInstall water hammer arrestors (sold separately at hardware or home improvement stores) between the fill hose and the washer.
Causes and checks
Plumbing in the home moves or flexes when the water valves in the washer shut off. This is not caused by a defect in the washer. Source: Troubleshooting: Before Calling for Service, p. 37
- Install water hammer arrestors (sold separately at hardware or home improvement stores) between the fill hose and the washer.
Household water supply pressure is very high. Source: Troubleshooting: Before Calling for Service, p. 37
- Adjust the household water supply regulator to a lower pressure.
Licensed plumber Contact a plumber to have a regulator installed if needed.
All 2 causes checked. Contact LG Customer Information Center: 1-800-243-0000.
Service
If the checks above do not clear it, contact LG Customer Information Center: 1-800-243-0000, lg.com/us/support. United States (Canada: 1-888-542-2623). Source: Using Smart Diagnosis, p. 38
Other WM3670HWA problems
- Door does not open when the cycle pauses or finishes2 causes in the manual. First: the tub is too hot. A safety lock keeps the door shut to prevent burns.
- Washer does not turn on2 causes in the manual. First: the plug is not in properly.
- Washer vibrates, thumps or is noisy4 causes in the manual. First: the shipping bolts are still fitted.
- Washer smells musty or moldy3 causes in the manual. First: detergent residue and dirt build up in the tub, on the door gasket or in the drain pump filter.
- Water leaks around the washer2 causes in the manual. First: A faucet or water line leaks or is loosely connected.
Sources
- Owner's Manual, Washing Machine WM3670H*A. LG Electronics Inc. Document MFL68639738, revision ver.081KCH/BB, 89 pages, en-US. gscs-b2c.lge.com. Listed on the manufacturer's support page. Retrieved 13 November 2026.
Page numbers are the numbers printed in the manual. Where this page and the manual differ, follow the manual.