I have a turbo air tsr 49sd refrigerator. no error codes. temp continually reads 39 degrees after reset, condensor and evaporator are clean, fans are working. always resets to 49 degrees

no the defrost thermostat only need be checked at cold temp and at room or reg temp it should not show any continuity have u checks ur heating element out as well and defrost timer ? I still suspect a faulty thermistor the freezer has more than one thermistor?

since you did not supply the entire model number, don't know if this is a cooler or a freezer. if a freezer, -10 is good. if a cooler, not good. could be multiple reasons for low pressure if a cooler. you should also consider the high side pressure too as this can also help indicate a short charge. more info is needed to continue.

Hello,

You can fix this, just follow the procedure given to enable get back your refrigerator going,
Check the temperature setting
Assure that there is enough room for air flow in the freezer or freezer
Check for air flow restrictions in vents
Test the temperature control
Clean the condensor coils
Check the door seals
Test the door switch
Test defrost heater
Test defrost timer
Test evaporator fan
Check for a clogged drain tube
Check for refrigerant leak
Freezer is too cold

Check the temperature setting
Test the temperature control
Freezer is noisy

Hissing and popping is normal, it is the defrost heater.
Check that the freezer is level
Check the drain pan
Check the condensor fan
Check the evaporator fan
Inspect the compressor mounts
Freezer runs continuously

Defrost the freezer
Clean the condensor coils
Check the door seals
Freezer starts and stops frequently

Clean the condensor coils
Check the outlet voltage
Test the condensor fan
Test the compressor relay
Test the overload protector
Test the compressor motor
Freezer does not defrost automatically

Test the defrost timer
Test the defrost heater
Test the defrost thermostat
Freezer has an unpleasant odor

Remove spoiled food
Clean freezer interior with a solution of h
Clean freezer interior with a solution of hot water and baking soda
Clean the door seals
Remove breaker strips and check for wet insulation
Water on floor outside of freezer

Check the drain pan
If you have an ice-maker, check the water supply hose going into and coming out of the water inlet valve
Water inside the freezer

Check for a clogged drain tube
If you have an ice-maker, check freezer and ice-maker for level

I hope this will help in solving the problem......

Change the temp control,check to see if it is iced up on the evaporator

Check to see if your hear your evaporator fan is running in your freezer, then check behind the refrigerator and see if your condensor fan is running. Make sure your condensor coils are clean under your fridge. Your symptoms are leaning towards dirty condensor coils. Good luck!

http://turboairinc.com/TB-Service/Service%20Manual%20%20-%20April%202008/TSF-49SD.pdf
check out this manual and see if your answer is there.

things that need checking:
refrigerant level. Super heat. Condenser clean? Compressor effeciency.
These are things that an experienced tech can check. If you have some experience and gages/ tools, I can give you some things to do but most of this requires experience.
Let me know if I can be of any further help.

Have you checked the evaporator fan(freezer fan), This problem is hard to detect because the fan spins but not fast enough to circulate the chilled air thru the freezer and refrigerator.

MOst common are left to right start,common .run. Russ