Supply fan motor is either shot or needs to be cleaned. Generally if the whole wall is shaking there is a bearing out on the motor.
I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_54ae41aaaffbab00
SOURCE: C4 error code on LG artcool airconditioner
www.yx2.fi/LG/wall_and_art_cool_error_codes_2007.pdf
Please read this article, I think it will help you solve your problem
SOURCE: a/c not blowing cool air
hello. I can help you. There are several possible reasons for your problem Here they are. Read them over and it will give you insights into how your A/C works.
Is the thermostat knob turned to the proper setting? Is the compressor motor
running? The compressor is a football-sized case with no apparent moving parts.
It is located inside the air conditioner at the center. Is it humming or making
any kind of continuous noise or causing the lights to dim? If it is making a
continuous noise, and your air conditioner is still not cooling at all, there
may be a serious problem with one or more of these areas:
These items are not user serviceable. You will
need to contact a qualified appliance repair technician to repair these
components.
If the compressor is not running but you do have power to the
air conditioner there may be a problem in one or more of these areas:
The air is cool but doesn't seem cold
enough
If the air doesn't seem cool enough
it is necessary to use a thermometer to check the difference in temperature
between the air going into the unit and the air being blown into the room.
Ideally, the temperature difference should be more than 15 degrees. For example,
if the temperature going into the air conditioner is 80 degrees, the temperature
coming out of the unit should be at least 65 degrees or less. If the difference
is 15 degrees or more there is probably no cause for concern. If the temperature
difference is less than 15 degrees you should check the following:
Check to make sure the air damper is closed. If
it's open, it will bring in outside air and reduce the efficiency of the
unit.
During the winter season many people cover
their air conditioners to protect the unit from the weather. In the spring or
summer they will sometimes forget to remove the cover. If your unit has a cover
on the outside portion of the air conditioner remove the cover first.
The condensing coils will always be on
the "warm" side of the air conditioner. That is, on the side that faces outside
of the room to be cooled. Air is drawn into the back of the air conditioner on
the sides through vent slots and is blown directly out through the condenser
coils. If the coils get clogged with lint, dust and dirt the cooling system
cannot provide the cooling necessary. To clean the coils it will be necessary to
remove the entire cover of the air conditioner or pull it out of the wall to
gain access to the coils. They can be cleaned by blowing compressed air at them
or by using a soft bristle brush to wipe the dirt off. It is important to also
clean any dirt or lint build-up in the bottom of the air conditioner so the
condensate water will be picked up by the condensing fan slinger properly.
SOURCE: LG Ductless Mini Split System LAN125hv: Heat pump doesn't run.
CA: Compressor Discharge Sensor Fault
Contact a qualified service technician and have them replace this sensor.
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