Thanks for the question.
Is this a freezer on the top model.
Please send me the model number.
The drain behind the freezer panel could be blocked up stopping the air flow to the fridge .
Remove the freezer panel and if it is thaw that out and clear the drain to the drain pan under the fridge this should fix the problem if it is iced up.
Ok we can continue tomorrow .
The # XXXXX on the breakdown is the defrost timer theres a small cog on the timer you can turn slowly till the fridge turns off , then wait i5 min to see if the defrost heater comes on to thaw the frost on the freezer coils , if it does replace the defrost timer.
This is the defrost thermostat its connected to the defrost heater you need a meter to see if this part is open if it is it wont send the current to the defrost heater, its a common part to fail.and could cause the problem.