My refrigerator just showed problem code Er ff. Can I open the fan motors to defost without making matters worst

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

Error Code Er FF
This code is not to be confused with the O FF or demo mode error message. The "Er FF" error code indicates a problem with the unit's freezer fan. The freezer fan controls the temperature in the freezer. The source of this error is most likely ice buildup. As with the Er IF error, allowing the unit to thaw should resolve the issue. Contact customer service if the error code continues to be displayed after having thawed the unit.

Hope helps.

Er FF is Error, Freezer Fan. The fan blade in the freezer is most likely blocked by some ice or frost. Clear that and the control will see the feedback from the fan showing that the motor is turning and the code will clear.

ER FF is freezer fan motor failure code. this directs air into the fridge compartment from the freezer room. dead fan=warm fridge.

The common service code ER FF is
Abnormal freezing
BLDC motor

Motor defect, hooked of lead wire
to fan, contact of structures with
fan, short or open of lead
wire(there is no signal of BLDC
motor more than 115 seconds in
operation of fan motor)

It appears you have a fan problem.

Er FF - Freezer Fan Error - This can be caused by frost accumulation on or around the freezer fan. Unplug the unit for 3-4 hours to allow this to melt off. If error code persists, call Customer Service.

code for defective freezer fan motor. ER FF

er ff means that the control board is not sensing evap fan motor operation this means either a bad fan motor ice in the fan motor or bad control board. you can verify fan operation by opening freezer door and feeling for old air blowing from back of freezer compartment. you will have to push in the light switch to get fan operation.
for corndo that has same problem you actually have a different problem. er dh means the control board is not sensing defrost heater operation. the most common culprit is a bad defrost sensor. message me back if you need instructions for trouble shooting..thx peyton

ER FF is a freezer fan error. Basically the mainboard is not receiving a feedback signal from the freezer fan motor within 65 seconds. When this happens the error code will come up and then none of the buttons will work.

You can clear out the error code by unplugging and plugging the machine back in. The error code will come back if the problem persists. Check around the freezer fan motor fan blades to see if ice buildup is interfering with the operation. Clearing out this ice may fix the issue.

If the problem comes back, then the fan motor may be getting ready to go out or the unit may not be defrosting properly.

Hope this helps, please rate my solution.