Your fridge does not have a defrost timer is uses what is called an adaptive defrost control.
It is located in the control panel of the fridge it is a little electronic control.
If the fridge is not defrosting you will have to see if you can manually initiate a defrost.
To do this open the fridge door and push the light switch five time with in six seconds.
If the heat and defrost thermostat are in working order the fridge will defrost.
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