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Model GRFS2853AF1 Frigidaire No auto defrost
The freezer evaporator not defrosting could be caused by a failed defrost heater, evaporator sensor, or even a main control. If you press and hold the freezer up and down buttons for 10 seconds, the refrigerator should enter a diagnostic mode. This is also done to exit diagnostic mode. The fresh food down button can be pressed until the display shows the number 2. This should turn the defrost heater circuit on. After a minute, the heater should be hot enough to hear water hit it as the ice melts. Are you able to hear water sizzle as it hits the defrost heater?
I can get the diagnostic mode to come up on the control panel and when I press the fridge plus button I can go through a bunch of numbers and they all say off. I know the issue has to be with the defrost. When I take it apart and hair dry the condenser, it will work for 3 or 4 days.
The defrost heater can be tested for resistance after unplugging the appliance power cord to verify if it has failed. The defrost heater should measure around 35-39 Ohms of resistance unless it has failed. Here is a link to the defrost heater used with this model. 5304531011 Heater | Genuine Frigidaire OEM In Stock