Multi Air flow fan is noisy on lg lrfd21855st refrigerator

call a technician to come and test the thermostat or diagnose the problem

THE FAN IS IMPEDING AIR FLOW AND MAY HAVE AN ICE BUILD UP DUE TO A DEFROST PROBLEM? OR THE FAN PROPELLER HAS BROKEN

check in the ducting in between the freezer and fridge compartment for obstructions such as an ice ball or collapsed lining

Google above part. There are too many options to list.

Probably a control Board problem. Without model #, I can't say for sure, but your fridge probably has a defrost board and not a timer.

Failure of the freezer fan motor of fan motor circuit.

You may need a service call.
Make sure they are factory authorized for LG

freezer fan

check the refriderant or it could be the compressor is going bad and will need to be replaced

The freezer fan is a known problem - I just had mine replaced. I was told that there is a newer motor part that has a better sealed bearing. I paid approx $80 part + labor.

Re: the ER FF - that is directly related to the freezer fan. I also had the ice maker circuit board replaced as part of the LG recall and they also fixed things (w/o me asking) like seals, door latches, light relay switch (reports of fires) and it seems like it's working. good luck.

Sounds like there's an airflow problem to the top section. Things that cause no cold air to the top fridge section are... frozen up coils completely blocking most of air flow (defrost cycle not working), evap fan not working to blow air up to fridge, air control dampers in fridge closed or not working properly, or frozen air ducts supply/return. Pull the whole drawer out the bottom and take the rear inside back off to expose the coils. If they are frozen solid the defrost t-stat or defrost timer could be bad (heat element not usually bad). If there is a nice white frost all over evenly then that's OK. Check that the fan is running when the compressor is running to blow the air up and that there are no blocked air ducts, etc. If all that is good, check if you can feel good air flow from the upper vents with the lower door closed (that shows there is no blockage and the fan is running).