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Do you have a model number so I can better assist you? It should be located on a sticker around the front frame of the tub and can be seen if you open the door.
OK well if PF is the only thing showing, then your control board has failed. Below is a link to the control board inside the door that you'd need to order and replace for your model I'm sorry to say.
CLICK HERE for control board
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Ah, well that is great because it will be under warranty still so you can call warranty out and they will replace the faulty part, but unfortunately it has failed even in the short time you've had it.