If the unit and fan is iced over this means that either the defrost heater is not working the defrost timer is not working the control board is faulty etc.
Kenmore elite refrigerator evaporator fan not working.
First let s see if the evaporator fan runs in the diagnostic test mode.
Etermine if the evaporator fan motor is defective try turning the fan blade by hand.
To enter the diagnostic test mode on this kenmore model within 2 seconds press the light switch 3 times and then press and hold it a 4th time until you hear a long beep.
You re now in the test mode.
This is the round disk that sits on the evaporator on the top right it should have a brown and orange wire going to it this part should read less than one ohm.
If the fan blade does not turn freely replace the fan motor.
If the evap fan is not working the freezer will be cold near the evap unit but not elsewhere in the freezer.
That is the most common thing on this unit.
The defrost cycle varies between makers.