I replaced the defrost thermostat and the defrost timer. That corrected the problem. Be careful when ordering your parts. I put in my model# and they gave me a defrost timer that was incorrect. I had to return at my cost and order the correct one. Don't assume because you put in your model# that the part is correct. On each part there is a box to put in your model# to check to see if it fits your model. Don't assume that because you put your model# in before that it fits. If not sure, call them and they will get you the right part.