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This is not something you can just reset or correct without replacing the display board itself. The display board uses the frequency of the electricity (60 hz) to keep time so as long as you live in the US and not some place like Europe, it should count down like normal. If for some reason it's counting down or keeping time unnaturally, the display board will need to be replaced so below is a link to the part you'd need to order and replace for your model number. The part unfortunately is about $370.
CLICK HERE for display board
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