Assuming that the circulation fan is running and none of the ducts are blocked the problem is likely to be caused by frost accumulating on the evap core over time and it will eventually cause it to ice up. normally the frost is melted away during the defrost cycle (this it what makes a freezer (frost free") Ge redesigned the defrost heater with a 2 element heater to rectify the problem. The new part cost is about $35.00 and should completely dry out the evap core during the defrost cycle and solve your problem.
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Lets go over the way a sealed system works. There is a highj side and a low side. The low side is the side that passes through the evaporator coils inside the machine. Most times on the freezer side only, but sub zero has independent sealed systems for each side. Once it goes throug the evaporator its then condensed into a liquid state, the high side. This is also the hot side. Well, lower pressures in the low side would logically mean lower temperatures. So for the refridgerator not to freeze more freon is used on it to keep the low side pressure higher than normal, giving the cooling effect verses freezing. So, and here is the bad part, if you are seeing ice build up in the refridgerator side you have a freon leak some where allowing the pressure to be less than required to keep it above freezing. Call a service technician and depending on how the model, sub zero warranty is parts and labor covered for the first 6, and only parts from the 6-12 year.
if turbo fans not running then the evaporators probably froze up and wont cool at all unplug and replace turbo fan and make sure u let the unit thaw completely i recommend atleast24 hours and turn back on and make sure turbo fan is running and u should be fine
The fresh food section is cooled by the freezer section by forced air supplied by a fan. If you have air flow, check the temp inside the freezer. It should be between 0 and -10. If not look inside your freezer and see if you have ice built up on the back panel. If so you have a defrost problem that is most likely a bad defrost heater, a bad termination thermostat or timer. If ther is no ice then check your fan under the refrig. If you can hear the compressor running it should be turning. If this all checks out then you have a freon system problem like. Low Freon pressure or a restriction.
You say fan seems to be working? it either is or it is not working. If you are getting a reduced airflow in the cabinet, it may indicate that the evaporator coil is iced up and needs to be manually defrosted.
is it side by side or freezer on top/bottom...check to see if the fan inside the freezer is running when the compressor is running..also check to see if ice is covering the evaporator coils.. the freezing should be even with a thin layer of ice/ not partically melted..sometimes the ice forms in the vents and stops the air flow...to review...check and see if fan is working in freezer check to see if vents are clogged......good luck!!
All cooling starts in the freezer section where the evaporator is. Too much stuff in the freezer can inhibit the necessary airflow around the evaporator and cause it to freeze. Usually, the next defrost cycle will thaw it, but it can keep the cool from coming out. There are so many things that can cause the lack of cooling, but most often, it is NOT the compressor. e.g. - if there's water pooling on the inside at the bottom, you have a bad door seal. If no real cool ever happens and you don't hear the hum of the compressor often, you defrost timer is bad.