Yrur model number is missing the last three digits.... I will use FRT21H8CB1 as the example model number.
You need to do a total manual defrost with a catch basin and comprtment drain cleaning.
- Unplug the unit
- Remove fgreezer contents
- Direct an exteranl fan into the freezer compartment for just over 2 hours to ensure the compartment drain tube has defrosted.
- During the defrost period... open the fiberboard panel on the lower back of the refrigerator and clean out everything, Condensor coils, catch / drip pan (Called pan-defrost for parts), and the END of the compartment drain tube.
Defrost pan Item 26 of above link needs to be cleaned.
Coils Item 1 need to be cleaned
Fan blade Item 61 needs to be cleaned.
The evaporator trough, drain item 17 also should be clear. Here is what you can do without tearing everything in the back of the freezer apart. Once your sure the comprtment drain tube (no item number / bulk hose) is clean on the end. Use the exhaust
of a Vacuum cleaner and the hose to force air UP through the drain hose and float out any debris from the trough drain. Have a 2nd person listen for air flow into the freezer compartment if possible. The biggest problems with freezer compartment drains is the END of the hose at the defrost pan underneath the unit clogs up and then the compartment drain hose just loads up with scum. Then the freezer stops draining and you have the symtom your describing.
After the manual defrost and cleaning return the unit to normal service.
Having said all of that... if the refrigerator then freezer starts warming up in 3 - 4 days... you may have an automatic defrost problem causing the icing. I.e it is not defrosting so the evaporator eventually ices over and forms an ice block in the back and bottom of the freezer compartment. Usually if there is an ice block that forms you wil hear the evaporator fan striking the ice build up.
If this is happening... for sure there is an automatic defrosting problem and your stuck doing a manual defrost ever 3 - 4 days until repairs are complete.
One more note.. if there is NOT any compartment drain tubing visible... your unit may port evaporator tray water down the back of the fresh food compartment to the defrost pan under the unit... just clean everything that serves as a drain function best you can during the manual defrost and cleaning process.
Thanks for choosing FixYa,