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Well it looks like I have a bad defrost thermometer. I'll have to check out the thermistors when I replace the defrost thermometer.
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The defrost thermostats on these refrigerators give very little trouble mostly because they are very high temperature like 140 degrees so they never cut on and off. The only reason they are there is for a safety back up. You can check for continuity across it. There is picture on the page below, if your thermostat looks like that replace it. The little white thermistor at the top of the coils controls the defrost time it could be bad. Some of these refrigerator had thermistors that failed often there is a picture on the page below that will help identify this thermistor. With all that being said the defrost heaters are the most common cause for this problem so if they check bad there is no need for anymore testing just replace the heaters. Hope this helps! GE Refrigerator Repair Guide
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I am going to manually defrost my freezer again. While I have the panel off and the coils exposed I am going to check for continuity on the defrost heater. Next is there a way to tell if the defrost thermostat is OK. I also read on this forum to follow some troubleshooting steps under the "sticky" GE (GS &HPS), however I was unable to find this note.
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