On a lg refrigerator what does error code er if?

"er if" is related to the ice maker fan. It is located beside the evaporator next to the freezer fan. If ice builds up on the ice maker fan it will cause the error.

LG says to unplug the refer for a few hours to defrost it, and it may work again. If the error is still there the fan may need to be replaced. The cost of the fan is $55.00 to $75.00 depending where you buy it.

Hope it helps. I had to replace the fan on mine, it's not a tough job.