What does 1F mean on panel next to service light?

LG Refrigerator Error Code Er 1F or Er IF
The ice maker fan is not working properly. Try defrosting the freezer first before trying to replace anything.

A F1 or 1F error code on the refrigerator's display indicates a problem with ice blower fan or ice maker motor.
search LG error 1f and u will find lots of info

Error Code Er 1F on new Kenmore Elite Bottom Freezer Refrigerator...

Error Code Er 1F on new Kenmore Elite Bottom

do u mean er 1f?

It means Ignition Failure. They heater went thru its startup cycle, and when the gas valve opened, the heater did not sense a flame. The whole routine begins again. After about 3 attempts at this, the heater will flash IF and then go into a lockout situation. This is a safety feature of this heater.

the codes are listed back of your ref.and what they mean

ice maker fan(IF)

Find the technical data information. It is a document somewhere in the refrigerator. It could be under the front, which, means removing the kick panel, or in the back behind the rear panel. Once you locate the tech sheet it might enlighten you are to what the error codes are. With this information you can make an informed decision as to how to proceed with your next actions.

The service manual with the codes is available at:
LG LFX25960 Service Manual

"ER IF" show a problem with the ice maker fan motor.

Error code 1F indicates an abnormality of the BLDC fan motor for ice making, caused by a poor BLDC motor connection, DriveIC, and TR. This information can be found in the service manual on pg. 32 of the service manual: http://136.166.4.200/contents/Fridge/LFX25960/LFX25960_Service_Manual.pdf
From the research I've done it sounds like it is usually a bad fan motor that causes this condition. This will prevent the icemaker from working. I'm not sure if it will affect the defrost cycle. If you turn off the icemaker, then either pull the plug for a few seconds or turn off the circuit breaker for a few seconds, the front panel will light up and stay lit. Then you need to call for service.

PS: I'm finding out that this refrigerator is more problems than it's worth. First it was the drawer glides breaking, then a balky ice maker, now the fan motor. From what I found out on the internet, I'm not the only one with these problems. I've only bought two LG products, the refrigerator and a small LCD HDTV, but I'm not happy with either one of them. In my opinion LG is an inferior product.

Hope this helps someone.