Pull your fridg away from the wall and on the left bottom locate a plastic box. This is your defrost timer.Turn the middle knob till the fridg compressor stops. Then remove freezer back panel and check frost pattern. If completely frosted and you see no defrost heater getting hot, you probably have a bad defrost thermostat, a little round thing clipped on the evaporator. If it is open when cold, that would confirm it is bad. If you do get defrosting action, your defrost timer that you just turned is bad.
Defrost coils with a hair dryer and click on yor model # above to get order info.
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