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Good afternoon. My name is ***** ***** I'll be helping you with your dryer today. Unfortunately F70 means that your interface control board (the board with the display where you push all the buttons and such to select the cycle) is failing to communicate with the main board. If you have already tried to unplug the unit for an hour at least and it didn't reset, then the interface control board just needs to be ordered and replaced to resolve the issue I'm sorry to say.
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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?