LG WM3400CW Owner's Manual page 39

Problem
Odors can occur if the drainage
hose is not properly installed,
back inside the washing machine).
Using the dry function, odors can
Odor occur from lint and other laundry
matter sticking to the heater.
(Dryer model only)
A particular odor can occur from
drying wet clothes with hot air.
(Dryer model only)
Possible Cause
TROUBLESHOOTING
Solutions
When installing the drainage hose, be sure that it
doesn't become kinked or blocked.
This is not a malfunction.
The odor will disappear after a short while.