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Good afternoon. My name is ***** ***** I'll be assisting you with your refrigerator today. Unfortunately error "ER CO" means that your main control board on the back of your refrigerator isn't communicating properly with the display board. Try to unplug the refrigerator for 5 minutes to see if the electronics will reset. If that doesn't work, then make sure the wire connections to the main board are secure and replace the main control board on the back of unit if everything checks good.
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Hello again. I'm just following up because I haven't heard back from you and I see this question is still open and unrated. Is there anything else I can help you with?