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if by turn off do you mean make the fan stop running ? if so sometime in the past few years someone decided to make machines like this run the fan all the time , but they do cycle the compressor motor to regulate the rooms humidity level
Error code 67 is an airflow problem. Either clogged filter or bad blower motor. Unplug unit remove bucket and feel for filter in front behind cover it drops down. Clean filter with water and reinsert. Plug unit in turn to "on", fan should begin to run, after 3-5 minutes compressor should start. If fan does not start it is bad and should be replaced.
It may not be the fan, as much as it the compressor vibrating. This occurs if the unit is not sitting on level flooring or on a carpet. Why I carpet? I do not know, but my LG unit does the same thing. I have found that smacking the sides of the cabinet simultaneously with my open hands, stops the vibration and the noise.
if however, it is the fan making the noise, it too can be affected by an UN-level surface. In addition, the fan shaft made need lubricating. WD40 works well for this or light machine oil (like sewing machine oil) will work too.
With the unit unplugged, open the cover and check the alignment of the
fan. If the fan is stuck or rubbing against the fan cowling, adjust the
fan motor's mounting hardware so that the fan turns freely.
If the fan motor is quite hot to the touch when it is running and the smell is like something burning and the fan blade isn't rubbing on the housing then the fan motor bearing are most likely worn out. If that is the case then the fan motor is bad and needs to be replaced.