Have LG refrigerator with ER 1F code

I have seen this issue before. As long as you do not find anything preventing the I would replace the ice fan motor. I have attached a link to the part.

If you need any parts call our parts department at 1-800-830-5465 or order on line at http://www.savemoreonparts.com See video link to repair videos..https://www.appliancevideo.com/appliances/lg-lfc28768st-refrigerator/
Yes, pull the freezer grill off. There may be ice forming in the ice room fan area preventing the motor from turning.
ER IF error means the computer does not register the fan motor for the ice maker turning.
Check the evaporator, make sure it is defrosting completely. You may need to replace the defrost sensor in the evaporator area.
Check gaskets around ice maker door inside left ref door and the gaskets on the side of the left ref door. The ice room fan always turns off when either ref door is opened. Here are 15 video links to help with this repair. https://www.appliancevideo.com/appliances/lg-lfc28768st-refrigerator/ If you need any parts call our parts department at 1-800-830-5465 or order on line at savemoreonparts.com