“Circuit board has a blinking four times what does it mean?”
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Hope you have the extended warrantee. this information is not in book I think. call Best buy and ask them. this is similar to problem I had when I called a repairman and he just showed me how to hold down certain buttons on door computer to correct and reset. ?? sorry I am not much help but I understand problem. In your case I think it means you have to change the filter. do that.
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