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It would have to be completely dried out, shut the power down to the unit and dry the sensor off completely then turn it all back on and try it. Use a hair dryer or heat gun and make sure it is totally dry.
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Could be a leak or moisture developing, keep an eye on it and see if it comes back.
I was just touching base with you because I have not heard back from you and the question is still open and unrated, if there is something else I can help you with follow up questions are free and can still be handled even after you rate the service thanks.