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If the rest of the coil is lightly frosted, it sounds like the defrost cycle was shutting off too early. Move the defrost sensor clipped onto the top of the silver coils over closer to the area where the ice block was forming and that will make sure the heater doesn't turn off until it's completely defrosted.
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Yes, that is why I said I would move the defrost sensors to an area where the frost is building up. That will make sure the defrost heater stays on longer to ensure it's all defrosted.
I have been instructed by the factory to do this before, so yes this would be a factory recommended repair.
Hello again. I'm just following up because I haven't heard back from you and I see this question is still open. Is there anything else I can help you with?