The code ER CO keeps coming on, on the display panel. The fridge and freezer still work but the code keeps coming up. Any info on that?

Unplug the LG fridge and wait 20 minutes - Plug back into power - Many times the code will clear or reset. If not keep reading below... -The majority of the time it is the freezer fan causing the Er FF error code. The FF error code indicates that the freezer fan motor is defective.
https://removeandreplace.com/2017/08/27/lg-refrigerator-error-code-er-ff-how-to-clear/

https://www.lg.com/us/support/help-library/error-codes-refrigerator-CT10000021-1441392048805

ER CO is an indication of a communication error between the display board and the main board. Has this unit had a board replaced recently? If so, one of the multi pin plugs may have not gotten connected firmly, or an incorrect board may have been installed. The problem has nothing to do with the dust.

This is an error code for the icemaker fan motor.
If the control does not see a signal coming back from the fan motor you will get this error code.
Please see the image below from the service manual that explains the ER IF error code.

http://media.fotki.com/1_p,wkbwtkdqbqkgrkkxgtqsskgwtqkq,vi/ktfgsrbbdxktrrwffdr/1/1303472/5961857/image18067img-or.jpg

The ER IF code indicates a failure of the icing fan.

You may notice slower ice production but the other fans should be okay.

You can select the ultra ice option and see if the fan toggles on.

The fan or the control is bad.

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Er-FS error code: Failure of freezer sensor.
I have been finding the fuseable link in the defrost system on these models open preventing the defrost cycle.
This would involve removing the freezer back panel and removing the sensor and fuse from the evaporator.
It's just a plug in.

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The Er Co error code signifies a communication error between the display control board on the freezer door and the main power board on the outer back panel of the refrigerator.

Check the wiring and connections between the low voltage interface and the main high voltage board.

If you are able to unplug the refrigerator and remove the cover over the control board on the back of the refrigerator,
you can check the wiring connection on the main control board.

If this wiring connection is okay, check the wire harness connection under the hinge cover on the top of the left hand refrigerator door.
If these connections are okay, then you will need access the wire harness connection in the dispenser.


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I fixed it. ER FF is "Error Freezer Fan." Once the evaporator fan stops turning for more than 115 seconds, this error message will be displayed. This fridge is poorly designed and is not designed with air gaps or enough air gaps to allow air behind the back panel of the freezer where the fans and condenser coils are located thus causing ice to build up around the fan and it's ability to spin. The evaporator fan helps cirulate the cold air generated by the condenser coils.

The fix is (1) defrost your refrigerator which means you'll loose all your food if you don't have another unit to keep the food in until it's done defrosting or (2) to dismantle the entire freezer by removing all the trays and railing so that you can pull the back panel far enough to get the front end of a hair dryer over the top lip of the panel to melt the ice. My unit had ice build at the top right and left corners behind the panel. I opted for the latter and didn't have to throw any food away.

This is going to be an annual chore if I want to keep this refrigerator. We should all ban together and call for a recall.

This first thing I would do is remove the panel on the back of the fridge to access the control board. It should be about half way up on the left hand side if you are looking at the back of the fridge. There should be four 1/4" screws to remove. In the middle of that board there should be a reset button. Press that button then let me know if that worked.

You have a defrost issue and needs to be serviced by a qualified LG technician.  The freezer fan motor is blocked by a large chunk of ice behind the rear panel of the freezer section.  You will need to remove the rear panel to get access to the fan and get rid of the ice.  This will get your refrigerator working again but this problem will return.  You will need to have your control board replaced.

There is a communications error between the control board and the display board.  Check the connector located on the top hinge cover.  Remove the hinge cover and check to make sure the connector is tightly secured.

You may have a serious issue with the wiring harness inside the refrigerator.  You will need to have the technician come back out and check the continuity of the wires leading from the control board to the fan checked out.  If there is no continuity, it is not repairable.