From the tech sheet.
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F8E1 Water Valve Failure
F8E1 indicates that no voltage is detected at the water valve relay. This fault code will ONLY appear when in the service diagnostic mode. See TEST #7, page 10.
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F3E6 Moisture Sensor Open
F3E6 indicates that the moisture sensor strip is open. This fault code will ONLY appear when in the service diagnostic mode. See TEST #4, page 8.
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I will send you the tech sheet via PM as it's to large to attach.
Please let us know what you find or if you have any more questions.