Hi and welcome to FixYa. I am Kelly
Make and model number please. I am going to post this as a solution but if you need data specific to your make and model number your going to have to pass it on to us. Without it all I can do is pass generic data and can not tell you how to start an automatic defrost cycle with your defrost timer due to varying locations of the different model defrost timers or controls.
Most of the time when a freezer will not reach a termperature expected there is an ice build up on the coils. You might get about a 2 or 3 day relief by doing a manual defrost with a fan placed in front of the freezer for a little over 2 hours blowing into the freezer compartment. It will make a water mess so be prepaired.
After the manual defrost is completed check the temp 6 - 8 hours later and see if it is below 26 degrees. If it is below 26 degrees you may have a defrosting problem and the original symptom will repeat in 2 - 3 days if there is a defosting problem.
The evaporator fan not turning full speed can also cause the same temperature problems.
Thanks for using FixYa.
Kelly
Dirty condenser, condenser fan motor is not running, freezer overpacked, bad thermostat, evaporator ice build up and it blocks the air flow. evaporator fan motor is not running or sealed system problem.
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