Down behind the grille you will find the defrost timer It looks like this
The little gray button can be turned with a screwdriver, turn it until it clicks. Now see if the heaters in the freezer come on, this should take a few minutes. If they come on then replace the defrost timer.
If they don't come o then you need to unplug the refrigerator and test the heaters they look like this
They are probably going to be hooked together at one end so remove a wire from the end of the bottom heater and check with you ohm meter from the one unhooked end to the wire coming out of the other end of the top heater. So you are checking the circuit through both heaters. If you get a reading move on to the defrost thermostat it look like this
Again remove one wire from where it is connected and check for a circuit. No reading on either heaters or defrost thermostat which ever is bad. You will need to defrost the coils and you can do so with a hair dryer be careful not to melt the plastic parts and your done.
Hope this helps you out. If you should need anything further please don't hesitate to ask.
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